In Vienna in 1911 Gustav Klimt finds a woman's body in the Danube canal and, while sketching her, she coughs and proves alive. Back at his studio Klimt and his model Wally tend the nearly feral woman who cannot remember who she is, and he names her Judith. She recalls being stranded in the Arctic a century earlier, locked in a crate by Victor Frankenstein and visiting the Underworld. Many people pursue her, including Geoff, a giant croissant eating devil dog of the North.

At eight, Alfie discovers he can undo any moment and live it again, but he must accept the consequences of his second attempt. He uses the gift to erase embarrassments, test risky near-death experiences, and shape his love life until he falls for Gianna, but he learns one caveat: once he undoes a love, that person can never love him again. Years later, an ailing Alfie is arrested after allegedly cheating at roulette, and a detective's interrogation gradually reveals his life and its outcome.

A lonely eighth-grade half-vampire struggles to keep his true nature secret while navigating bullies, a loyal friend, and the humiliations of middle school; as mysterious threats and his own violent urges intrude on everyday life, he must confront painful secrets from his past and make difficult moral choices about who he will become.