- Roger has invited his old friend Phillip, and his wife for a cruise on his luxury yacht - together with Denys and his wife Valerie in order to see whether Denys, his employee, proves suitable for an important job abroad.
- All seems set for a restful holiday.
- Complications start however, with the first arrival, Roger's estranged wife Lisa.
- The philandering Phillip turns up with his latest acquisition, the super-sexy Mercy, instead of his wife.
- Soon every conceivable permutation and combination of twice three has been achieved, with the clumsy Denys losing his contact lenses and stumbling around doing damage everywhere.
- Even Roger's unseen secretary Betty Samuelson is drawn into the plot before the final hilarious and unexpected climax erupts.
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