The Immortal by Gena Showalter — book slip

Halo Phaninon, a ruthless assassin of gods, is tasked with killing twelve of mythology’s fiercest monsters in just twenty-four hours. However, he finds himself trapped in a time loop, reliving the same day over and over.

The only constant is Ophelia, a harpy warrior who also remembers each loop. Despite being a family disappointment, Ophelia is determined to break free from her cycle of repeated deaths.

As Halo and Ophelia spar each day, their connection deepens, and Halo's desire for her grows. But escaping the loop means losing each other forever.

For fans of J.R. Ward's books.