
Recent high school graduate Max is looking forward to his visit to Mercury Labs, an honor for top science students, when his mother tells him he's already been there—yesterday. Then Eve, the daughter of the Lab's top scientist, Dr. Sylvan, calls Max and asks him to return what he took from the Lab. But Max doesn't remember anything at all, and discovers that there are two Eves and two Dr. Sylvans. Which ones are real and which are imposters? What does Dr. Sylvan's work on the chaotic bifurcation graph have to do with time travel?
- Publishers Weekly
Author

William Warner Sleator III was born in Havre de Grace, Maryland on February 13, 1945, and moved to St. Louis, MO when he was three. He graduated from University City High School in 1963, from Harvard in 1967 with BAs in music and English. For more than thirty years, William Sleator thrilled readers with his inventive books. His House of Stairs was named one of the best novels of the twentieth century by the Young Adult Library Services Association. William Sleator died in early August 2011 at his home in Thailand.