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A browsable collection of 50 mysteries, pairing brief facts and images with possible explanations. It invites curiosity about unusual claims, but the amount of evidence behind each explanation may vary.

The mystery pairs seasonal spookiness with a more personal puzzle: how to judge coincidences when you are worried. Mary Anne’s friends are part of the investigation, not just bystanders.

Expect a clue-following mystery told through a character’s journal, rather than a straightforward narrative: readers are invited to piece together Cathy’s story from mixed materials.

This historical romance combines a conflict over Heather and her father’s settlement and a fire with a question of whom Heather can trust. Romantic attention and danger are intertwined, while Heather remains unsure who is responsible.

A classic-style detective setup: Nancy follows two mysteries at a zoo, with a suspect who may have been framed and a trap that puts her in danger.

A club-saving mystery driven by four friends’ attempt to secure money intended for their Boys Club.

A fast-moving Hardy Boys mystery pits an environmental campaign against deliberate sabotage. Frank and Joe pursue a case involving a workplace death and evidence of serious crimes, with their investigation placing them at risk.

This is a comic animal-detective adventure built around an investigation, a mistaken accusation and a race involving a lost city and treasure.

This is a murder mystery centred on Pip’s effort to reassess a closed case. The investigation brings buried secrets and suspicion into a town still affected by the deaths.

A school experiment meant to defend Samara's character becomes a puzzle involving unusual DNA patterns and undeciphered manuscripts. The story also brings faith, aliens and uncertainty into the discussion.

A question-led introduction to ancient Rome, touching on legendary origins, public entertainment, bathing and the traces historians can use to understand the past.

A mystery built around a discovery, a suspect Parker distrusts, and an investigation that draws in his more cautious friend. Their search leads to a frightening secret and a tense situation at the shop.

This is a ghost mystery built around an investigation by two friends and Grandma Louise. It may appeal to readers drawn to unexplained happenings and historic settings.

This is a fast-moving detective adventure built around a stolen hydrofoil, a criminal gang and the search for clues. Astrology features through Chet's newly acquired knowledge.

This is a two-girl mystery built around a disappearance and a murder investigation. The familiar detective-fiction connection comes through Alice’s collection of Agatha Christie books.

This is a horror mystery built around Abby’s effort to learn what happened to her mother. Its appeal may lie in the unanswered disappearance and the group’s encounter in the cave.

A village mystery sets children on the trail of missing chickens, with cats becoming their suspects.

The combination of a detective puzzle and a civic debate gives the story two points for discussion.

A ghost investigation doubles as a mystery about a past drowning, with Dare’s public podcast persona at odds with her private scepticism. The book also includes a romantic connection.

A fast-moving premise combines a secretive organisation, a flight into hiding and a mystery tied to Jimmy’s new experiences. The book appears to centre on what he can prove and whom he can convince.

A child-centred sports mystery combines a disputed accusation with clues to interpret. The appeal is likely to rest on following the investigation, rather than on sports details alone.

This is a supernatural detective mystery, pairing an observant assistant with an investigator who sees beyond ordinary appearances. Its opening case brings a serial killer investigation into that fantastical premise.

This is a survival mystery built around the Hardys’ search for a missing teacher, with nature study and practical wilderness skills alongside suspense.

This is a comic animal-centred mystery in which Teddy returns to detective work, investigating a serious accusation amid zoo mishaps and a public campaign.

A lively historical-fantasy mystery for readers interested in baseball: Joe and his father pursue an unresolved question about Babe Ruth while confronting the unusual possibilities and responsibilities of time travel.

A supernatural mystery about Janie, whose cemetery sketch seems to carry a message from beyond the grave. Her friendship with Bobby and Keith develops alongside questions about belonging, belief and a secret connected with the dead.

A suspenseful family mystery follows Footer as she investigates what happened after a devastating fire. Her mother’s bipolar disorder and Footer’s uncertainty about her own perceptions make the investigation emotionally complicated.

A comic fantasy mystery built around unusual weather, an imprisoned uncle and a determined group of friends.

A straightforward mystery with a teenage investigator, a friendship that supports the enquiry, boxing as a recurring motif, and danger that increases as questions are asked. It offers clues, action and school intrigue rather than an unusually experimental structure.

A straightforward team mystery with a spooky surface: the appeal lies in clues, investigation and deciding whether an apparent haunting has an ordinary explanation.

This is a clue-led children’s adventure about investigating a disappearance after an accusation of theft. Its central appeal is the Secret Seven working together, with a younger sibling presented as a possible complication.

This offers animal fantasy built around clans, ancestral voices, prophecy and an emerging internal threat. Its strongest draw is likely the combination of a troubled community, spiritual mystery and a young character with unusual access to warning voices.

This is a supernatural horror story about a shy teenager whose dream relationship becomes controlling and threatening. Its main appeal is the uncertainty over what is real, while its fast pace repeatedly shifts between mystery, pursuit and grotesque danger.

A fast-moving Hardy Boys mystery combines exploration, investigation and danger. Frank and Joe follow the mystery of a swallowed statue into tunnels and an abandoned underground city, where a criminal group threatens Bayport.

A brisk comic adventure about children investigating suspicious adults at a phone-free retreat. Expect secret trips, lizards, alligators, captivity and criminal schemes alongside friendship, teamwork and characters learning from new information.

A school-based detective adventure follows two sisters as they investigate a threatening note, pursue puzzling clues and confront danger surrounding a newly acquired bronze fountain.

This is a fast-moving detective adventure combining a workplace mystery with abduction and wilderness survival. Its strongest appeal is likely the escalating investigation and physical danger, though the ending and resolution are unclear.

This is a time-travel adventure centred on friendship, fairness and an orphan’s vulnerability. Its historical setting and Christian-life framing may offer a lively starting point for discussing how stories represent justice and belonging.

This is a brisk detective adventure built around a mountain-bike race in Costa Rica. Nancy supports her friend while investigating efforts to stop a leading cyclist, with several possible suspects and a time-pressured mystery.

A history shaped through reports, legends, personal accounts and attempts to explain events. Its appeal lies in encountering ancient societies and a historian’s way of weighing stories, rather than following one continuous fictional plot.

A lively historical mystery follows Scooter from helping with staged séances to investigating a death after finding a dead man in Houdini’s torture tank. It offers adventure, period atmosphere, supernatural imagery and a brisk first-person voice.

This is a brisk family mystery built around bereavement, public scrutiny and uncertainty about who caused a parent’s death. Its strongest pull is the siblings’ effort to face painful events and question the accepted story.

This offers a clue-driven adventure combining detective work, a camping journey and mounting peril in the Rocky Mountains. The central appeal is likely the Hardy brothers’ investigation rather than supernatural material, though the supplied details do not explain the title’s vampire reference.

A warm, unconventional family story is paired with a mystery inherited from Kip’s late father. The book offers questions about belonging, memory and change, while introducing unsettling ideas about teenagers and infection.

A suspenseful historical novel linking a present-day investigation with a teenager’s experience of the 1921 Tulsa race massacre. It combines mystery, racial history and questions about privilege, social inequality, identity and justice.