Randall & Hopkirk (Deceased) S01E11 - The Ghost Who Saved the Bank at Monte Carlo

Marty's eccentric old aunt, Clara, unaware of his death, comes to the agency, seeking a bodyguard to accompany her to the roulette tables of Monte Carlo where she hopes to put into practice her foolproof winning system. Jeff and Jeannie go with her and she wins a fortune but two gangs, one British, one French, are after her secret and steal her 'little red book' though this proves to be worthless as her system is in her head. When heavies abduct Jean, the best way to save her seems to be to show that Clara can lose as well as win, requiring Marty to 'doctor' the roulette wheel.