Cerberus, son of the dragon Typhon, hundred-headed hound to Hades, Gatekeeper to the Underworld, Watcher of all the souls in Styx, and first shifter, senses an unauthorized mortal in Hades's domain. And when that mortal tries to escape, he does what he's always done best-stops them.

What he doesn't expect is a beautiful human woman cowering beneath his blade. When she begs for his help to leave Hades's realm, his loyalties are tested unlike ever before.