Ruben must find the rightful heirs of more than 16,000 euros as soon as possible, otherwise the inheritance will expire and the money will disappear in the state treasury. With the help of heir researcher Klaas Zondervan, he delves into the enormous Houtkamp-van Zwietering family. During his research, he finds online family trees that don't seem right and does something he hasn't done before.

Ruben Nicolai goes in search of rightful heirs of unknown legacies. During his search for these heirs, special family histories often come to light.

It concerns a ring from the war, which came into her possession through her family on Liberation Day. The ring belonged to Harry Joseph Platt, and Ruben wants to find one of his relatives so that the ring can be returned to its rightful owner. But things turn out completely differently than expected: Harry's family suspects it is a scam or fraud. And so, the ring remains with its current owner. In the second case, we start in Brussels. Artist Harry Wiggers has nearly €50,000 in his coffers, but he had no children. Perhaps Harry had brothers or stepbrothers. There is a half-sister named Monique, but she has passed away. Now the trail goes cold. Harry Wiggers was part of the Cobra art group, and perhaps this will lead us to someone entitled to his inheritance. Ruben eventually finds a second cousin of Harry on his mother's side, who receives one-eighth of the inheritance.

Ruben is looking for an heir who is entitled to a sum of more than 13,000 euros. In his search, Ruben makes a number of discoveries that lead him to the rightful owner. But this person seems to have disappeared without a trace for years. Will Ruben still be able to find the lucky one and hand over the inheritance?