Betrayed and abandoned by her boyfriend on wedding day, Kalina has decided to open unusual business that will once and for all solve problems of male fidelity. She decided to help women testing loyalty of their partners. Everything goes well until Kalina has to seduce Maciej - coach and specialist in female - male affairs. His wife Beata suspects that he is cheating on her and wants to have irrefutable evidence. Kalina, knowing class "opponent" starts working with redoubled energy, but this time all her plan goes wrong. Maciej is not like other man whom were easily caught cheating.
Karol, an ordinary young man, runs into a much older man, whom he believes to be the so-called Red Spider, the terrifying serial killer prowling the streets of Kraków in the 1960s. Karol becomes obsessed with the man and spies on him. In the meantime he meets Danka, a slightly older photographer, working for the local newspaper. Tempted by love, fascinated by death, Karol will soon have to make the most important choice of his life.
Michalina Wislocka, the most famous and recognized sexologist of communist Poland, fights for the right to publish her book, which will change the sex life of Polish people forever.