Ten minutes ago, Sam discovered a hidden room.

Five minutes ago, he picked up a book about Dracula's castle.

Two minutes ago, he found a way to travel through time.

Now . . .

The adventure begins.

"Dramatic cover art will draw readers to this time-travel story, and the fast-paced adventure will hold their interest. . . . Translated from the French, the novel's appeal comes from both well-drawn characters and a swiftly moving story. With the central mystery as yet unsolved, a villain still unmasked, and Sam's father in peril at the end, readers will be scrambling for the second book of the planned trilogy." -- Booklist

"This French import has enough plot and historic detail in each destination to create distinctive moments without overwhelming the central story of Sam’s struggle to find his father. The style is everyday colloquial with exclamatory touches, making this an accessible and quick-moving read. . . . Time-travel fans will jump headlong with Sam into his big adventure." -- Bulletin of the Center for Children's Books

"Prévost sets up the various locations with lightning efficiency as Sam hurtles through one period after another; readers cannot afford to blink. This is a souped-up, older relative of the Magic Tree House books; kids who liked that brand of history and adventure but have outgrown the format will welcome the more sophisticated presentation here." -- Publishers Weekly

"This remarkably inventive, fast-paced tale is reminiscent of A Wrinkle in Time, if slightly more grounded in reality. Prévost's real triumph is his stunning historical fiction, which convincingly transports readers everywhere from Ancient Egypt to WW I and might inspire YAs to learn more about those times and places. . . . The wide appeal of time travel and a wrenching cliffhanger ending will have readers wanting to go forward in time to read this marvelous tale's sequel as soon as they've laid it down." -- KLIATT