Dreams of stardom had lured Martyn Tarne from faraway New Zealand to make the dreary, soul-destroying round of West End agents and managers in search of work. The Vulcan Theatre had been her last forlorn hope, and now, driven by sheer necessity, she was glad to accept the humble job of dresser to its leading lady. And then came the eagerly awaited Opening Night.

Wealthy Sir Hubert Handesley's original and lively weekend house parties are deservedly famous. To amuse his guests, he has devised a new form of the fashionable Murder Game, in which a guest is secretly selected to commit a 'murder' in the dark, and everyone assembles to solve the crime. But when the lights go up this time, there is a real corpse....

The lives of the inhabitants of Swevenings are disrupted only by a fierce competition to catch the Old Un, a monster trout known to dwell in a beautiful stream which winds past their homes. Then one of their small community is found brutally murdered; beside him is the freshly killed trout. Both died by violence - but Chief Detective Inspector Roderick Alleyn's murder investigation seems to be much more interested in the fish.

It started as a student exercise, the knife under the drape, the model's pose chalked in place. But before Agatha Troy, artist and instructor, returns to the class, the pose has been re-enacted in earnest: the model is dead, fixed for ever in one of the most dramatic poses Troy has ever seen. It's a difficult case for Chief Detective Inspector Alleyn. How can he believe that the woman he loves is a murderess? And yet no one can be above suspicion.

The crime was committed on stage at the Unicorn Theatre, when an unloaded gun fired a very real bullet; the victim was Arthur Surbonadier, an actor clawing his way to stardom using blackmail instead of talent; the suspects included two unwilling girlfriends and several relieved blackmail victims. The stage was set for one of Chief Detective Inspector Alleyn's most baffling cases.