When journalist Lily Bigelow is found dead in the courtyard of Carrickfergus castle, it looks like a suicide. But there are just a few things that bother Detective Sean Duffy enough to keep the case file open... Which is how he finds out that Lily was working on a devastating investigation of corruption, at the highest levels of power in the UK. And so Duffy has two impossible problems on his desk: who killed Lily Bigelow? And what were they trying to hide?