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A tower theft mystery unfolds through 13 robberies and the loss of the numbers from an ancient emerald clock. Solving riddles and examining detailed illustrations helps readers investigate the case and pursue a related hunt for 12 buried numbers.

A forensic mystery follows Cameryn as she assists her coroner father and encounters a case involving someone she knows. The serial killer’s attention may put her in danger too.

The mystery centres on an old murder investigation, a rare coin and a collector who threatens Charlie to protect a secret.

This is a dual-protagonist mystery: Alice and her tutor Iris investigate what happened to Brooke, while Alice’s earlier disappearance remains unexplained. Their search involves a reward, a suspected boyfriend and clues from Christie’s mysteries.

This is a friends-on-the-case mystery built around apparently eerie happenings and the possibility that someone wants the girls to leave. The friends set out to investigate rather than simply accept the haunting story.

The story centres on two friends pursuing answers after Hamilton’s father is poisoned, with suspicion falling on several people around the family.

This illustrated adventure combines a mystery about a brother’s death with a task to protect a valuable diamond. Ivy’s family life at a funeral home and her encounters with several people drive the plot.

Three pet mysteries bring Sly, a schoolgirl who also works as a private detective, into the odd goings-on around her neighbourhood.

Malinda arrives at her mother’s home and finds that its beauty masks family secrets. She remains to seek the truth, while facing frightening events and threats to her life and sanity.

The story combines horse riding and competition with a mystery: Vivienne suspects Harmony may have witnessed the vet’s death and begins investigating whether it was murder.

The siblings face a mysterious forest, Aunt Eda’s many rules and questions about their missing uncle. Strange creatures, night-time sightings and the contrast between chills and humour shape the story.

The brothers’ involvement begins when Tim uncovers Alan’s secret plan, leading into an unexpected mystery. The contents include Scottish place-names and historical references.

A school competition and a vandalism mystery run alongside Peasprout’s effort to become a champion. The story also centres on siblings entering an unfamiliar academy as outsiders.

Jamie’s sudden ability to understand boys is presented as a strange school mystery, and she explains it to herself as superpowers. The story also brings her friendship with Isabella and Angeline into the picture.

Maddie’s first trip abroad combines exploration of Northern Ireland with questions about Ryan’s family past. Her changing ideas about her future and developing friendship with Ryan run alongside the mystery.

A dystopian adventure about loyalty and uncertainty: Kaspar must question the story he has been given about the conflict while serving as a Guardian.

Abby welcomes True Blue to her family’s ranch, though her father is wary. The horse’s previous owner died in a car crash; his pacing and the strange whispers Abby hears prompt questions about that woman and her connection to him.

A paranormal mystery follows Cassidy as she pieces together missing memories and investigates whether her death was other than the suicide people assume. Romance and regret are part of her effort to understand her past.

Mara has lost her memory and is drawn into the Messenger’s harsh system of games and punishments. The story also follows people facing consequences for cruelty and other wrongs, while Mara’s own role remains a mystery.

Jessica’s love of dolphins is part of her everyday life, from learning about them to wearing a dolphin piercing. Her summer also includes time with friends, beach activities and a family trip to America.

A horse-and-friendship story with a ghostly mystery: Ellie and Jonah try to discover whether a haunting lies behind the guests’ worries and the threat to the family business.

This is a comic school mystery as well as a friendship story: the newcomers must piece together what is happening while learning how the school’s social world works.

Emily and Stanley investigate a noise and try to help the crying Thing get to sleep. Their attempts do not work, leaving the question of what is troubling it at the heart of the story.

A strange lift mystery drives Álex and Olga to investigate an unlisted floor, where wishes have sinister consequences and require a sacrifice.

This is a horror mystery about ambition, apprenticeship and an unsettling disturbance at an animation studio. Buddy and Dot investigate what is happening as the studio works towards a deadline.

A haunted-house mystery drives the story: Amethyst is drawn to a strange home and becomes increasingly connected to it while trying to uncover what has happened to its residents.

A school mystery grows into a suspense story with gothic and fantastic touches. Blanka’s investigation draws on the convent’s history, while the Wolves’ hostility and uncertainty about whom to trust keep tension close to school life.

Expect a speculative adventure combining a search for a missing brother with demon-hunting work and interdimensional intrigue. Ehrich must also conceal his origins and work out whom to trust.

Megan's move and difficult start at school lead into a mystery involving a haunted-house rumour, an archaeologist's diary and clues to a secret linked to the Parthenon.

Nora investigates a family mystery while trying to work out whether she can rely on Patch.

Claire’s arrival in Paris brings new sights, people and language, alongside the pleasure of exploring with Camille. Her curiosity about why she was sent there drives the mystery.

Expect supernatural mystery alongside questions of loyalty: Zoey and Stevie Rae share a secret, while friendships and enmities shift around them.

Two teenagers who each believed Charlie loved only them join forces after his apparent death. Their search across several cities becomes a suspenseful journey into what they knew—and did not know—about him and each other.

A teenage heroine’s strange inheritance draws her into a perilous struggle involving monsters, assassins and a family appeal to join the “family business”.

Expect a fast-moving fantasy adventure built around magical threats, unfamiliar creatures and a mystery about the Diadem’s rulers and an unseen helper.

The mystery turns on whether Walter is a threat to his family, with the Hardy brothers investigating alongside Greg and Mike. A diary, a kidnapping and a scheme against Walter drive the action.

Expect a historical mystery-adventure: the friends investigate a suspicious death, seek proof about an earlier imperial murder, and encounter danger on the Roman frontier.

Expect a suspense-led investigation involving serial killers, a secretive group, and danger to the young investigators. The central mystery also concerns Cassie's mother and what happened to her.

A post-war mystery begins with a ghost-hunt misunderstanding and develops into a story about hidden danger in a village still marked by rationing and hardship.

This historical mystery pairs Violet’s hopes for a more exciting life with a family mystery and a series of murders. As girls go missing and being murdered, Violet suspects Joseph may be hiding a terrible secret.

A twisty teen murder mystery, driven by Emma’s investigation and Sutton’s emerging memories. Expect secrets, suspicion and tense relationships alongside the central question of who killed Sutton.

A summer at an elite riding academy becomes a search for answers about a girl who disappeared on a trail ride. Brynlei’s investigation draws opposition, and she faces a choice involving a secret and a life.

This family story pairs bereavement, a difficult move and money worries with a ghostly mystery. The siblings’ search for answers unfolds alongside their adjustment to a new home.

A ghostly cemetery mystery set during wartime: Flossie’s responsibility for the dead becomes harder as bombing unsettles them, and a soldier’s mysterious object draws her into a threat to the cemetery and country.

A lonely boy and a curious new friend explore a mansion and try to stop someone stealing a long-lost family treasure.

Rosalind’s unwanted journey becomes a confined murder mystery: one companion vanishes, two people are found stabbed, and she must try to clear herself while facing a sinister enemy.