The adventures of two girls from Zeeland in Zandvoort.

Jess Newton falls in love with Bruce Ravenhurst, but her father does not approve of the marriage. Bruce leaves for Africa to take part in an expedition, overcome with grief. Jess and her father also leave for Africa. There, Bruce and Jess's father become friends. Meanwhile, Bruce's cousin Hubert, who expects Bruce not to return, marries under Bruce's name in order to claim his inheritance. During an attack, Bruce goes missing and is presumed dead, and Jess returns to England, where Bruce is accused of bigamy. Fortunately, Bruce, who managed to escape despite being wounded, also returns, so that everything can be cleared up. The film has largely been lost – only a single fragment has survived.

Mavis Keeves is the daughter of a man who is ruined and dies as a result of reckless speculation, encouraged by Sir Harry Winderbank.

Anny helps Mario escape from prison after his attempted murder of Gaston de Roqueville, who is now married to Ninette. Banker Sorga, an enemy spy, attempts to steal Mario's latest invention: a powerful explosive that could alter the course of the war. Second part of Maurits Binger's epic trilogy, now considered lost.

Married housewife Alda decides to become a singer under the stage name 'La Renzoni', in a duo-act with her father. All goes well, until her husband mistakes her father for her lover...

When self-made businessman Pancras Duif decides to marry his much younger housekeeper, his entire family protests; eager to protect the family capital, sons Henk, Jan and Toon enlist a psychiatrist for help. The film is considered lost.

When his granddaughter is born, debt-ridden Colonel von Zwenken misses out on Aunt Roselaar's allowance of 20,000 guilders. Anxious to keep the money, his son-in-law telegraphs the aunt that a son was born, Frans, and the girl is brought up as a boy. Based on the novel by Anna L.G. Bosboom-Toussaint.

The secret from the title is the lost recipe for shiny Delft pottery, that Jan Vogel is desperately trying to rediscover. For his attempts he needs platinum, but the funds run out because the factory owner Van Haaften has lost his money in stock-speculations. Luckily for Jan, he finds a farewell letter in the park, including a large sum of money. Meanwhile, the owner's son Leo confesses his love for Jan's daughter Annie, but Van Haaften forbids their marriage.

A collection of short scenes portraying highlights of Dutch history, from the Eighty Years' War to King Willem I's return from exile. This film was made to commemorate the centenary of the Dutch royal family.

A farmer's daughter falls in love with a farmhand.