Diagnosed with an incurable illness, Charles, a rugby tycoon who has made a fortune in New Zealand prints an ad in his hometown looking for his sister that he's not seen in fifty years. A notary clerk, believing that Charles has a terminal illness responds to Charles' search for heirs claiming to be his sister. Charles finds that he was misdiagnosed and returns to France to meet his long lost sister.

When Nénette discovers the identity of her father in a letter, she quickly goes off in search of him. But instead of finding her father, she is met by her half-brother, Paul. Paul, a bitter man who gave up his dream to take over his father’s pharmacy business, is less than thrilled at the arrival of his ‘embarrassing’ half-sister. After refusing to take her in, he soon gets a taste of his own medicine. Under the influence of a potent drug, for one day Paul is generous, happy and sensitive. The next morning, however, once the drug has worn off, his nasty side comes back...