Death Ex Machina (The Athenian Mysteries Book 5)

A theatrical murder shocks ancient Athens, in this mystery that “manages to effortlessly integrate laugh-out-loud humor into a fairly clued puzzle" (Publishers Weekly, starred review).
 
Athens, 459 BC: It's the time of the Great Dionysia, the largest arts festival of the ancient world, held each year in honor of Dionysos, the god of wine. But there's a problem: A ghost is haunting Athens's grand theater. Nicolaos and the priestess Diotima, his clever partner in sleuthing (and now in matrimony), are hired to exorcise the ghost, but secretly suspect that a human saboteur is operating behind the scenes.
 
Then, one of the actors is found hanged from the machine used to carry actors through the air when they play the part of gods. It's quite a dramatic murder, and as Nico and Diotima dig into the actor's past, they discover enough suspects to fill a theater. As the festival approaches and pressure mounts on all sides, can they hunt down the killer in time? Or will they simply have to hope for a deus ex machina?