Collar (Changing Roles, #3)

To catch a serial killer, Kate Summers is undercover and assuming a role she swore she'd never endure again. Playing submissive to a noted Dom isn’t the problem. The problem is Jake Davenport doesn’t do pretend. He’s fearless enough to push her boundaries, challenge her rules, and has her questioning everything. As her investigation progresses, Kate falls deeper under Jake’s spell, but she refuses to lose sight of her goal. She’ll stop at nothing to solve the case and catch the killer even when Jake’s complicated past turns him into her number one murder suspect.