It's the most popular question in Hell, and Mitchell Johnson has been answering it ever since he was hit by a bus at age seventeen and inexplicably ended up in the Underworld. Now Mitchell is The Devil's intern in Hell's accounting office. Lately, he's noticed a disturbing trend: the volume of new arrivals is straining Hell's limited resources. Then Mitchell overhears his boss discussing plans to limit newcomers with a legendary time travel mechanism. With a device like that, Mitchell realizes, he could change history and prevent his own death.

Mitchell's plot goes awry when his three closest friends—Alfarin, the Viking prince; Elinor, from 17th-century London; and Melissa, from 1960s San Francisco—insert themselves into his plans. It soon becomes clear that the fates of all four are entwined in dangerous and unpredictable ways. With unforgettable characters and a thrilling premise, this original novel is by turns funny, poignant, and thought-provoking.