Colton's Deadly Affair by Jennifer D. Bokal

When a reluctant partnership leads to a startling attraction.

With a serial killer on the loose, FBI Special Agent Sinead Colton was assigned to work with Wells Blackthorne. The NYPD detective truly didn’t want her assistance on the Landmark Killer case but lives were at stake. After a shooting and explosion, one of those lives just might belong to Wells. As guardian to his infant nephew, Wells had much to lose. And, Sinead soon realised, she had so much to protect.