The third and latest installment — The Diary of Lies — is now out from Soho Crime, and it finds Shona investigating a mysterious cabal whose aims are more than a little sinister. Not only is Shona catapulted into a murder plot, but she catches wind of a conspiracy called Grendel — that’s the monster in Beowulf, as you’ll recall. Now, as mysteries go, The Diary of Lies is unsettlingly dark. The darkness of The Diary of Lies is political — closer in spirit to The Handmaid’s Tale than to Twin Peaks. Her sheer doggedness is why, despite all its premonitions of tyranny, The Diary of Lies isn’t a bummer.