Sjöwall & Wahlöö: The Locked Room
A young blonde in sunglasses robs a bank and kills a hapless citizen. Across town, a corpse with a bullet shot through its heart is found in a locked room with no gun at the scene.
The crimes seem unrelated, but to Martin Beck they are two pieces of the same puzzle. Haunted by a near-fatal bullet wound and trying to recover from the break-up of his unhappy marriage, Beck throws himself into the case to escape from the prison that his own life has become.