Mrs. Derckz and Mr. Takma visit one another each day. They have share a terrible secret for sixty years. Now the secret may have consequences, as Derckz' grandson Lot announces his engagement to Takma's granddaughter Elly.

Lot introduces his fiancée Elly to the rest of the family - including his infamous uncle Anton.

Steyn is thinking of leaving Otillie and asks her son Lot for advice. Harold is haunted by the death of his father.

Having sent her son Donald money, Ottilie has little financial resources left and asks Takma for a loan. Lot and Elly get married and travel to Italy. Aunt Thérèse implies she is privy to the precious family secret as well.

It has become apparent that there are more people who know of the secret than Derckz and Takma. Ina is now obsessed with learning all about it herself. Elly and Lot visit Amélie in Italy while uncle Daan and his wife Floor arrive from the Dutch East Indies.

Takma dies, leaving behind a final letter containing evidence. Otillie returns to the Netherlands with her greedy son Donald for the inheritance.