I've only read the first three in the ten book Martin Beck crime series, written in the 1960s by Maj Sjöwall and Per Wahlöö, but I will definitely tackle them all some day. Vintage is bringing them all back into print - book #7 The Abominable Man, and #8 The Locked Room came out last month and the final two, Cop Killer and The Terrorists will be out next summer. These are best read chronologically so start with Roseanna. You'll be hooked, I promise, especially if you like the crime novels of Henning Mankell. There's a fascinating interview with Maj Sjöwall in the Guardian in which she talks about the writing collaboration with Per and their love affair (Wahlöö died 44 years ago). You can read the interview here.