Publisher Martin Jamison sends for Philo Vance as he wants to hire him as a technical advisor on the crime stories he publishes. Paul Morgan, Morgan's partner, regards the plan as foolish. Jamison tells his secretary Mona Bannister to bring Vance to his home that night and he will reveal the solution to the seven-year mystery of the killing of Sam Philips, former partner in the firm. Philips ex-wife, now a receptionist for the company, is alarmed when she overhears. As Vance and Mona drive up, two shots are heard and Jamison's body is later found in the trunk of Vance's car.