The Wild Wild West (1965)

S2E16 The Night of the Tottering Tontine

West and Gordon are tasked with safeguarding Dr. Raven, who is working on a classified weapon. Raven is part of a tontine, an investment collective where the last surviving member inherits the group's assets. When a member of the tontine is murdered and an assassination attempt is made on Raven, the agents jump into action. Their investigation leads them to a booby-trapped house, where two tontine members are scheming to eliminate the competition and claim the funds for themselves.