Andrzej and Grzegorz are students of Warsaw Conservatory and preparing for the International Piano Competition. Eva - a beautiful Grzegorz's girlfriend is seriously ill, the doctors suspect she has brain cancer. Even for the sake of health and life of his beloved Grzegorz disagrees to miss even a single day of preparation for the contest. Andrzej has a girlfriend Zosia (the daughter of a professor of music), but the young pianist falls in love with Grzegorz's girlfriend and takes care of the sick Eve.
Lionel Twain has invited the five greatest detectives to a "dinner and murder." How can they resist? Included are a blind butler, a deaf-mute maid, screams, spinning rooms, secret passages, false identities, and more plot turns and twists than are decently allowed.
In Madrid, the orphan sisters Irene, Ana and Maite are raised by their austere aunt Paulina together with their mute and crippled grandmother after the death of their mother and their military father Anselmo.