"Mason and Ty were once the very best of friends, like two nerdy sides of the same coin . . . until seventh grade, when Ava Petrakis came along. Now Mason can trace everything bad in his life to that terrible fight they had over the new girl. The one thing he'd give anything for is a do-over. But that can't happen in real life--can it? As a science kid, Mason knows do-overs are impossible, so he can't believe it when he wakes up from a freak accident...

"Stella and Tom's quest to solve the riddle of their neighbour's disappearing dog over the summer holidays soon leads to a boat buried under a grassy mound - and a tunnel that takes them to a secret lake. Who is the boy rowing towards them who looks so terrified? And whose are those children's voices carried on the wind from beyond the woods? Stella and Tom soon discover that they have travelled back in time to their home and its gardens almost 100...

Ranger, the time-traveling golden retriever, has landed in Viking age Iceland, where he helps a girl named Helga journey through the ash and smoke of an erupting volcano to find her father and bring him home.

Twelve-year-old Kevin Kim helps Chu-mong, a legendary king of ancient Korea, return to his own time.

John Blake and his mysterious ship are doomed to sail between centuries and when he meets a shipwrecked girl named Serena he promises to help get her back to her time, but first they must stop the sinister and powerful Dahlberg Corporation.

While sinister Lord Luxon makes himself at home in twenty-first century Manhattan, Peter and Kate, aided by Gideon, pursue The Tar Man through the streets of eighteenth-century London, when history is at its tipping point.

Cousins Beth and Patrick need to leave Lithuania before the Nazis arrive. But their friend Leza and her family, who are Jewish, also need to leave. Will they all be able to escape in time?