Murder in Immunity: A Doyle & Acton Mystery

The detectives called it "graveyard love," and it happened more than you'd think; a spurned lover would rather murder his beloved, than allow her to walk away. This case seemed no different than the usual-a murder-suicide, by someone who'd decided he couldn't bear such a rejection.
Doyle thought it was a bit odd, though, that the perpetrator worked for an armed transport company; you'd think he'd have been thoroughly vetted. And it was an interesting coincidence that the female victim had a...