Lang plays a song he wrote just for Lila, and demands that she appear in his new show or he'll tell the world that she poisoned her ex-lover Douglas five years ago.
Frightened, Lila tells fellow performers Diane and Millicent and understudy Gracie about Lang's return.
The real Winters says he was paid by a man, revealed to be Rita's husband George, to stay away from the apartment.
George admits he entered the apartment disguised as Winters to steal the incriminating letters Lang had, but cannot identify the woman he saw running out.
Lila overhears someone humming the song Carl Lang had composed, and realizes only the murderer would know the tune.