As Christmas draws near, Paolo, a successful professional, prepares to send his wife and son on a skiing vacation, so that he can spend quality time with Magda, his mistress. But a suicide attempt by his brother-in-law Felice, whose girlfriend has just let him, appears to ruin Paolo's plans. Ever the cynical opportunist, Paolo makes the most of his brother-in-law's pain, offering to go on vacation with him and help take his mind off his problems. Instead, he intends to dump Felice and take Magda on a splendid cruise to the Caribbean . Meanwhile, fate brings together Michela, an extroverted animal lover, and Luigi, a hardened bachelor and grouch. After a series of encounters-clashes, the two split up, vowing never to have anything to do with each other again. Little do they know that they will soon be attending the same wedding, one as a bridesmaid and the other as the best man, to be held on a splendid cruise ship sailing towards the Caribbean.