A Deadly Change of Heart — Gina Cresse

Unsatisfied with the detective's conclusion that the death was an accident, Devonie sets out to find the killer on her own. Her efforts to retrace the reporter's steps as she worked on her last story give Devonie a number of clues, and just as many suspects. The dead woman's estranged husband keeps landing at the top of Devonie's list, but stolen plutonium, homemade atomic bombs, and a shady drug dealer add other possibilities to her growing list of suspects.

When Devonie gets too close to discovering the identity of the murderer, she becomes the next target of a killer who'll stop at nothing to protect his interests.