In When I Snap My Fingers, Simon and Maria Moffat agree to undergo hypnosis as part of performer Sven Gali's act when a fire alarm sounds before Sven has had a chance to remove the effect of certain trigger words. The following day Simon has invited his boss Dan and Dan's wife Dolly round for dinner in the hope of salvaging his floundering accountancy career. With both Simon and Maria still susceptible to the key words, however, some very odd behaviour in the presence of their guests makes Simon's future look more vulnerable than ever.