Randall and Hopkirk (Deceased) (1969)

The Smile Behind the Veil (1x26)

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Marty sees a funeral near his grave. Based on what he overhears he's certain that his ""new neighbor"" suffered the same fate he did: a murder made to look like an accident. Jeff has an appointment with a prospective client and is unwilling to do something for Marty for free, so Marty must trick him into looking into the death.