Emma Watson Plays Daniel Brühl's Secret Girlfriend in Haunting 'Colonia' Trailer

Colonia, a film based on a real-life story and starring Daniel Brühl and Emma Watson, is nearing its release date, and with every passing trailer the film looks increasingly interesting. In the latest preview for the 2016 movie, the Hermione Granger actress and the Goodbye, Lenin! star join a cult that makes them keep their relationship a secret.

According to Yahoo! News, Watson plays Lena in the film, a young woman who must join a cult to find her partner, Daniel (Brühl), after he has been taken away by the Chilean government. She joins Colonia Dignidad (Dignity Colony), a terrifying place that housed torture during the early 1970s dictatorship in the South American country.

Following Daniel's trail after he was taken by the new government, Lena reaches Colonia Dignidad, where things get increasingly complicated as it turns out it's easier to get into the terrifying cult than it is to get out of it. During her time, she must hide her ties to the prisoner, as the two attempt to escape Colonia Dignidad through a system of tunnels.

The film, set in the early days of Augusto Pinochet's rule on the country (when persecution of Salvador Allende supporters was in its prime), is loosely based on true events. The real-life Colonia Dignidad was a pseudo-religious community that had ties to Nazi exiles, and as AV Club reports, may have even housed World War II criminal Josef Mengele.

Besides Watson and Brühl, the film, which was shot in numerous locations around South America and Europe, also stars John Wick actor Michael Nyqvist in the role of terrifying German exile Paul Schäfer.

Shown in the Colonia trailer as the front to the so-called religious organization, Schäfer was a real-life figure who fled his native country over counts of sexual abuse to minors and then created the creepy all-Germans colony just outside of Santiago, Chile.

Colonia will hit theaters and VOD on April 15.