Dead Men's Bones

Dead Men's Bones is the fourth book in the Inspector McLean series by James Oswald, and is my favourite to date. Yeah, I know, I'm late to the party and there are a lot more books after this one, but that's a good thing, right? It means I've got a lot to look forward to. Lucky me.
Anyway, back to Dead Men's Bones. Boy, did this one grab me and refuse to let go! It has it all. A body, completely covered in tattoos. The murder/suicide of a prominent Edinburgh family. Mysterious envelopes from a member of Special Branch. A possible link between the tattooed body and the suicide victim.
There are attempts from on high to have the murder/suicide investigation shut down.
As we all know by now, when Inspector McLean has the bit between his teeth, nothing will stop him. Unfortunately, in the face of this investigation, he finds it's not just himself he's putting at risk, but his whole team.
A gripping, disturbing, sometimes funny, engaging read.