Echo and Ember - NightShade Forensic FBI Files, #4

"This is a five-star series. Loved it!! Can't wait for the next one, please!!"FBI Agents Donovan and Eleri left their last case with a sense of unease. Unable to close the investigation, they've been thrown into their next assignment far too fast. A string of strange arson-based murders are just part of the trouble. Not only is former agent Wade de Gottardi on their team for this one, so are two other NightShade agents: Dana Brantley and Christina Pines.
The problem is, Eleri is no longer the senior agent, Dana is. Maybe their boss no longer trusts them, or maybe it's simply because four people have already died. Either way, Donovan and Eleri are no longer in control of the case as they hunt a serial killer who's getting bolder with each success. While Eleri and Donovan are just getting their special skills in hand, Dana and Christina are more at ease with theirs.
While Dana's talents prove useful, Christina's are frightening .