Visiting her grandmother in Australia, Livy, ten, is reminded of the promise she made five years before to Bob, a strange, green creature who cannot recall who or what he is.

"They say that a ghost witch lives in the woods, up on Brewster's Hill. They say her companion, Bloody Bones, has a pig skull for a face and stands taller than a man, his skeleton gleaming white in the moonlight. They say that the witch takes young girls, and no one ever sees them again. Daniel doesn't believe the stories about the witch or her beast. He figures the kids on the bus are just trying to scare him, since he's new. But when his sister,...

Time-travelers Jonah and Katherine are summoned to help another missing child from history, this time Virginia Dare from the Roanoke Colony, but their journey is sabotaged and goes dangerously awry, leaving them in the wrong time period. Includes author's note about the history of Roanoke Colony and Virginia Dare.

When Ted and Kat's cousin Salim disappears from the London Eye ferris wheel, the two siblings must work together--Ted with his brain that is "wired differently" and impatient Kat--to try to solve the mystery of what happened to Salim.

"With the heart-shaped herb thriving, a group of Wakanda's finest engineers working on expanding its dome technology, and the borders more fortified than ever, Princess Shuri can finally focus on what matters most: her training. But soon, a bigger problem rears its head. The princess hears whispers of exceptionally talented young girls across the world going missing; a young environmental scientist in Kenya, a French physics prodigy -- the list of...