Randall and Hopkirk (Deceased) (1969)

But What a Sweet Little Room (1x13)

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Julia Fenwick asks Jeff to find her missing aunt. The aunt stayed to herself, only going out once a week to seances. Jeff asks Jean to pose as a wealthy widow trying to contact her departed husband ""John"" to see what connection there is between the seances and a financial consultant who was the last person to see Julia's aunt.