On the verge of getting married to Marijke, young and insecure detective Jozef is assigned the case of a murdered factory girl. His relationship is threatened when he becomes madly infatuated with Carmen, the alluring prime suspect.

A captain saves a kidnapped magnate from a nursing home run by foreign agents.

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 poor fisherman's wife sends the remaining family members, her two sons, out to sea on a boat that has seen better days.

The wealthy De Roquevilles, the family of alcoholic veteran Jean Laurent, and that of farmer Godard; all have to deal with the outbreak of the Great War. To complicate things even more, Godard's daughter Anny falls in love with young Mario Laurent, who turns out to have inherited some of his father's vices. First part of Maurits Binger's epic silent trilogy.

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.

In the prologue, a boat with some shipwrecked persons is drifting at sea. Among them is Baron van Waldheim, who, before he dies of exhaustion, entrusts his little son Alfred to the care of his butler Hendrik. The evil Jan van Oort persuades Hendrik to give him the Baron's papers. When they put the boy ashore, he wounds himself on a nail (leaving a scar that will later prove his identity). For years Van Oort manages to pass himself off as Baron van Waldheim; he is married and has a daughter and a son. One day Hendrik turns up demanding a job as butler, swearing that otherwise he will betray Van Oort's secret. Meanwhile, Alfred - now an adult known as Ulbo Garvema - has become a teacher. Unaware of who Van Oort really is, he accepts the position of tutor to Van Oort's children. He falls in love with the daughter, but Van Oort refuses to give his consent to their marriage. Ulbo and the girl elope.

Renée isn't very happy in her marriage with colonel Brachart and starts a relationship with a young lieutenant.

Hugo Writley, the son of an American shipping magnate, travels to Holland accompanied by his steward, Longway. On the night of their arrival they go to a cabaret, where they get into conversation with two men and their girlfriends who, at closing time, invite the Americans to their home for a few drinks. The hosts, however, turn out to be 'land-sharks' planning to strip the two inebriated Yankees of their cash.

The storyline is about a man without a head that haunts the castle Arco in the 16th century. A man in the present day (1914) goes to the castle to find out if the story is true after which he finds something strange beneath the old castle floor.

An orthodox Jewish man refuses to accept the marriage of his daughter to a Christian man.

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.