Ten agonizing months have gone by since Therese faced off against her parents’ murderer at Mount Olympus, and she suspects Thanatos’s absence is meant to send her a message: go on with your life. She tries to return Pete’s affections even though her heart aches for the god of death, but when Than shows up to take her hamster’s soul, she becomes infuriated when he says he’s “been busy.” In cahoots with her new friend, who's gotten in with the Demon Druggies at school, Therese takes a drug that simulates a near-death experience, planning to tell Than off so she can have closure and move on, but things go very, very wrong. Eventually she learns Than has been busy searching for a way to make her a god, and he’s found it, but it requires her to complete a set of impossible challenges designed by Hades, who hopes to see her fail.
Fifteen-year-old Therese watches her parents die. While in a coma, she meets the twin sons of Hades—Hypnos, the god of sleep, and Thanatos, the god of death. She thinks she's manipulating a dream, not kissing the god of death and totally rocking his world. Than makes a deal with Hades and goes as a mortal to the Upperworld to try and win Therese's heart, but not all the gods are happy. Some give her gifts. Others try to kill her. The deal requires Therese to avenge the death of her parents. With the help of Than’s fierce and exotic sisters, the Furies, she finds herself in an arena face to face with the murderer, and only one will survive.