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Three partners in Rupert Courtney Associates embark on a macabre venture to collect a large insurance tontine they established years earlier. They agree to gamble two of their three lives through suicide, leaving the lucky survivor to collect the entire payout under the survivor-takes-all policy. Courtney, who devises the scheme, intends from the outset to manipulate the odds. Robin Scott becomes involved through the firm's secretary, Delisa Monetti, a luscious Italian woman he met in Rome during an earlier case. His investigation remains one step behind the killer's shrewd machinations, and one man dies before Robin forces a confrontation that leads Courtney to kill himself—the only genuine suicide. Ironically, Harry Winslow, whose thwarted suicide attempt inspired the scheme in the first place, ends up with all the money.