Rain Dogs — Adrian McKinty

"2017 Edgar Award Winner" (best paperback original)"

It's just the same things over and again for Sean Duffy: riot duty, heartbreak, cases he can solve but never get to court. But what detective gets two locked-room mysteries in one career?
 
When journalist Lily Bigelow is found dead in the courtyard of Carrickfergus castle, it looks like a suicide. Yet there are just a few things that bother Duffy enough to keep the case file open. Which is how he finds out that she was working on a devastating investigation of corruption and abuse at the highest levels of power in the UK and beyond.
 
And so Duffy has two impossible problems on his desk: Who killed Lily Bigelow? And what were they trying to hide?