Sins of the Flesh. Sin Hunters, #1

Paranormal powers. A hunted heroine. A lethal protector. A passion that defies the mission. Dying from a brain tumor, world-famous musician Caterina Shaw agrees to a radical gene therapy-and wakes up with terrifying new abilities she can't control. Before she can understand what she's become, she's framed for murder and forced to run from the people who turned her into their secret weapon. Mick Carrera was hired to eliminate her.
Instead, he finds a vulnerable, extraordinary woman he can't walk away from. As desire ignites between them, deadly forces close in, determined to destroy Caterina and bury the truth.