What Makes Women Laugh?

Luci, Graci and Mar, three sisters that make a comedy trio, go to the wedding of their father with a woman who is years younger than him. During the feast Luci's husband dies in an accident. Despite the tragedy, the trio have to fulfill their commitment acting during August in Benidorm. The widow discovers thanks to a notebook that her husband cheated on her, so she decides to flirt with everyone.