Night at the Vulcan, (Roderick Alleyn #16), Ngaio Marsh. New York Felony & Mayhem, 2014, originally published in 1951.

Summary: An actor is found dead in the actor’s dressing room at the end of a play. It appears to be suicide by gas asphyxiation, but Alleyn finds clues pointing to murder by someone in the company.

Another Ngaio Marsh theatre mystery. She loved the theatre and set a number of murders there. For once, Alleyn was not in the audience and a witness to the death!

Martyn Tarne is an aspiring actress come to London from New Zealand. At least before she was robbed of most of her funds and repeatedly rejected for parts. Her last stop was The Vulcan, where she heard a new play was being staged. But the cast has been finalized. The play begins in a few days. But all is not lost. She overhears that the female lead, Helena Hamilton, has lost her dresser. She asks for the job, and is afforded a place to stay, first at the theatre, and then with Jacques Dore, the set and costume designer.

There are a number of fraught relationships within the company. Helena’s former husband, Clark Bennington is a fading, alcoholic actor, relying more on tricks and upstaging others than skill, particularly provoking character actor J.G. Darcey. Helena has had a long term affair with Adam Poole, her male lead and also the manager of the theatre. Gay Gainsford is Bennington’s niece who he has been able to get cast, even though she is a poor fit for her part. Meanwhile, the playwright, Dr. Rutherford hangs about the theatre, cruelly ridiculing the actors, especially Gainsford.

Martyn adds to the tensions by her resemblance to Adam Poole. As it turns out, she is a distant relation. In the play, Gainsford plays a part in which her resemblance to Poole features in the climactic scene between the two, a scene that she hasn’t mastered in looks or acting. Tarne is asked to read for the part as an understudy and it is plain to everyone that she should have been cast for it, including Bennington and Gainsford.

So many possible murder victims. So many possible suspects. The murder is made to appear to be a suicide by gas asphyxiation, which has happened once before when the theatre was named the Jupiter (featured in a Marsh short story). But Alleyn finds evidence to the contrary, not the least that the victim’s makeup had been refreshed for the curtain call and had previously boast of a letter from an Otto Brod being a “trump card.”

One of the unusual features of this is that Alleyn, after several hours, solves the murder on the spot. There is the culminating scene of the whole cast gathered as Alleyn walks through the evidence–and then dismisses everyone–but the murderer doesn’t leave.

This is well-executed. About half the story builds up to the murder, and about half involves the investigation. This is Marsh at her best in her favorite setting!