Ghost by RJ Scott

Can you ever hold on to a ghost?

Elliot is tracking an elusive killer, codenamed Ghost, with ties to organized crime. Every time the Sanctuary team gets close, Ghost slips their grasp.
Cole has nowhere left to turn. With his father dying and his sister in danger, he turns for help to the very people trying to track him down. Sanctuary’s assistance is what he needs to punch another hole in Varga’s organization.

When Elliot and Cole meet, it isn’t just passion that consumes them. When lust becomes something more, Elliot realizes that sometimes you can’t hold on to a ghost, and that sacrifice is often the only way to make things right.