The immortal
(Book)

"Halo Phaninon, assassin of gods, is as cold and merciless as a machine. For victory, he will cross any line. When tasked to kill twelve of mythology's fiercest monsters in twenty-four hours, Halo eagerly accepts. Except, each morning he awakens to the same day, forced to relive it over and over again. Only one other person retains their memory--the beauty who threatens his iron control. Ophelia the Flunk Out hates her disaster of a life. She's the family disappointment, a harpy warrior without a kill and powerless--or is she? Every night she's doomed to repeat her own murder, but every morning she rises to spar with Halo, a ruthless warlord increasingly determined to save her...and lure her to his bed. Halo's insatiable desire for the stubborn Ophelia drives him wild...and he only craves more. If he remains in the time loop, they stay together. But if he escapes, they lose each other forever." --book jacket