"Between life and death" - Dr Brinck and his assistant Inger Holm spend days and nights in his laboratory to experiment with a revolutionary medical cure for poisoning. Inger Holm is deeply in love with his boss. When the two scientists one day go to bed and visit an outdoor server, Brinck's manufacturer will meet Warren and his daughter Elsa and get an opportunity to help Elsa with a damaged foot. Thanks to him, he is invited to a party in the manufacturer's luxurious home...
Count de Faber is working on a new type of explosive, but finds out that Professor Plussman has beat him to it. After an unsuccessful attempt to acquire the formula from Plussman, he breaks into the professor's house, steals the formula, and kidnaps his daughter, Mary. He takes her to Carlsten Fortress.
"The Lighthouse-Keeper's Daughter". The film premiered on April 2 1918 at Brunkeberg Theatre in Stockholm . The film was to be the last feature film that was released from Hasselblad film before it went up in the newly founded Film Industry Skandia. Filming took place at the Hasselblad Studio in Otterhällan with exteriors from Böttö lighthouse outside Gothenburg by Gösta Stäring.
