Unfortunately for Guy, Bruno goes ahead with the plan and attempts to blackmail him into killing Bruno's father as repayment.
While on a train, Guy Haines (Farley Granger) explains to a fellow passenger Bruno Antony (Robert Walker) his frustration at his wife's refusal to end their marriage, which would allow him to marry Anne (Ruth Roman). Bruno suggests a sinister scheme in which the two commit murders for each other, an idea which Guy pretends to humor before leaving as quickly as possible. Unfortunately for Guy, Bruno goes ahead with the plan and attempts to blackmail him into killing Bruno's father as repayment. Hitchcock is clearly having a blast directing this nonstop thrill ride, as the buildup to the final confrontation between Guy and Bruno is some of the finest work of his esteemed career.