Charmed Forces by Camilla Chafer

Private Investigator Lexi Graves is pleased to clear up her latest assignment. It’s a simple case of misguided suspicion after all.
Then her brother, Detective Daniel Graves, turns up on her doorstep, alone, blood-spattered, and almost entirely incoherent. What happened to him? Where did he come from? And what, if anything, did he leave behind? Springing into action, the clues Daniel provides for Lexi lead her to a terrible scene that holds more questions than answers. Biggest of all, who is trying to frame Daniel for murder?
With Daniel’s memory sketchy, and now a wanted man, Lexi is determined to untangle what appears to be a case of murder-for-hire. It will take everything she’s got to unmask a dangerous foe before her brother goes down for crimes he insists he didn’t commit.