A priceless violin. And a dark secret someone is prepared to kill for.

Revised edition: This edition of The Quartet Murders includes editorial revisions.

DCI Oldroyd has seen his fair share of victims, but he has never witnessed a murder--until now. When world-famous violinist Hans Muller is shot and killed during a concert, the detective is faced with a case beyond logic. The culprit is nowhere to be found--and the victim's priceless violin has disappeared too.

As Oldroyd investigates the mystery of the murderer's identity and the motive for the killing, he enters the ruthless world of wealthy instrument collectors and stumbles upon a dark path where shocking secrets have been buried in the past. But the secrets will soon take centre stage.

Oldroyd must use all his cunning to recover the priceless instrument. But can he also solve the mystery of a murderer who vanished in front of his own eyes?