In Renaissance Siena, a city ravaged by plague, Sofia's mother carves beautiful mementoes for the grieving from the bones of their loved ones. But one day, she doesn't return home. Sofia and her friends follow clues carved in bone until they find the terrible truth ...

Ylva, a young Viking girl, is swept by a storm to England where she is orphaned. Determined to avenge her mother's death, she tracks the killer north. But when a stranger steps in, Ylva has to choose between vengeance and trust.

When the Full Moon Fayre makes a rare visit to Hollow-in-the-Marsh, six sisters slip out to see the famous Shadow Man, an enigmatic puppeteer. Afterwards, the oldest sister Grace is missing. Can twelve-year-old Willa save her sister from one fate and yet outrun her own?

Magpie witnesses a strange spectacle above the streets of Paris: a boy suspended in the air. It ends in disaster - even so, Magpie is enthralled by the idea of flying. But others, too, are determined to discover Montgolfier's secrets ...

Tamarind never knew her Indian mum, Chinty, who died soon after she was born. So when she arrives at her mother's ancestral home, she's full of questions for her extended family. But instead of answers, Tamarind finds a sad and beautiful mystery ...

Abandoned at a remote island school, Faye discovers she has been sent there for a wicked crime. Can she tackle the sinister mysteries of the island and discover the secrets within herself?

When Marina discovers a boy called William with a head of tentacles and crab claws for hands, she resolves to help him unravel the mystery of his past. But danger lurks among the fishmongers of the seaside town of Merlington ...

Pearl and Ellen are recruited to work at code-cracking HQ, Bletchley Park, during World War Two - but when they stumble across a sinister plot which threatens the very soul of the war effort, their budding friendship is put to the test.