But, as rehearsals finally get under way at the Riverside Theatre, police across town have entered the doctor's house—and discovered the body of his wife...

Why was Carl so late for rehearsal? Why is the Bignalls' neighbour so reluctant to tell the truth about what he witnessed? And why is Dr. Denis Leeward, Carl's partner, sitting in his car, slightly bruised and in a state of guilty panic?

All detective Chief Inspector Lloyd know for sure is that one of them is a murderer...