At a mansion costume party, folk are searching around and find the owner, Stephen Kessler(millionaire), dead. A couple, Jean
Kessler(granddaughter) and her boyfriend head out after cutting the house telephone wires and severing everyone else's transmission
wires before leaving. The cops catch them and bring them back.
The police detectives start questioning everyone in the mansion from the employees to all the guests. Michael Tracy, the
mystery writer, is doing the typical intellectually superior investigator attitude about Kessler and Jean's alibi.
Flashback shows Stephen cutting Jean's credit accounts because she's not falling his orders to his perfect degree. He even
calls the family attorney to cut her from the will...But that happens before the murder...
The cops continue questioning Jean and everyone else in the house.
That night, Jean, Michael, and Hall are snacking...Later, they hear a shot and find Hall dead...
The next day, Michael heads to town and researches Kessler's recent stock investments. Jean receives a late letter
from Hall, who was a mining engineer, in love with Jean's mother, Sylvia, who's husband died. Apparently, Kessler
killed his daughter. Hall wanted to get revenge on Kessler. However, someone got to Kessler before Hall.
Michael questions the accountant, Prichart, about Kessler's stock. Apparently, Prichart has been embezzling to
finance his wife on top of everything...
Michael tries to explain his plan to the police who ignore it...That night, Prichart tries to stab Michael who catches
him and makes him confess for Kessler's murder. In the morning, the cops find Prichart and his wife dead.
Michael watches Jean and her boyfriend drive off to get married...He starts writing this story as the credits roll.