Amber's Japanese father left when she was little, and her sister Bella was just a baby, so now she fills in the frustrating gap in her life with imagined conversations, and writes letters to Bella that seem to come from their father.

Investigating a string of disappearances amid supernatural occurrences in London, Alex and Ren discover the workings of a powerful Death Walker intent on destroying the city.

As Will Burrows continues to search for his lost archaeologist father in the strange underground world he has discovered, he stumbles across a sinister plot with terrible implications for the world above.

"Tess and Max encounter a new adventure through time, this time in London at Christmas"--

British schoolboy Ash Mistry, the reincarnation of the great Indian hero Ashoka and an agent of the goddess of death, faces the evil Lord Savage again after the villain sends his minions to capture Gemma, Ash's unrequited crush.

When Will Burrows and his friend Chester embark on a quest to find Will's archaeologist father, who has inexplicably disappeared, they are led to a labyrinthine world underneath London, full of sinister inhabitants with evil intentions toward Topsoilers like Will and his father.

When Hyacinth Hayward tries to learn more about the magical rivers under London and how her family is connected to them, she stumbles upon a plot to steal the ancient stones that hold the city together--

An American boy travels with his family to London for his mother to find his father, but it turns out his father was involved with something nefarious...and now so is he--

As fourteen-year-old archaeologist Will and his friends plummet down a subterranean pore, they face deadly creatures and discover a strange fungal shelf, which not only reveals artifacts from ancient civilizations, but clues to a lost land at the end of the Earth.

When shy, quiet Shylo overhears the plan of a band of ratzis to embarrass the Queen, he must travel to Buckingham Palace and convince the Royal Rabbits of London to stop them.