Lurking behind the peaceful facade of Oban, a picturesque west coast Scottish town, lies a mystery.

The disappearance of an unassuming bookshop owner lays bare a complex network of rare book theft. Detective Inspector Angus Blue, drawn into the case by the inexplicable circumstances surrounding Aino Carselaw's disappearance, finds himself embarking on a challenging investigation where priceless books hold the key to a dangerous plot.

As Angus delves into Aino's life he uncovers a passion for rare books that extends beyond her discreet backstreet bookshop. Her specialist expertise has attracted a secretive network of collectors, dealers, and thieves determined to possess these valuable books... and willing to kill for them.