Harry Styles is Caught in a Love Triangle in 'My Policeman' Teaser

Harry Styles is proving to love a period piece. Not only does he star in the 1950s-set Don't Worry Darling from Olivia Wilde, but he also stars opposite Emma Corin in My Policeman — which is also set in the 1950s, as well as the 1990s. 

This latter film, which you can get your first look at via a new teaser trailer below, follows a trio of characters in those two distinct decades of their lives. Based on the 2012 book of the same title by Bethan Roberts, the film explores the relationship dynamics that form when a gay man named Tom is not honest about his sexuality and instead chooses to marry a woman. While the marriage is embarked upon in the middle of the century, by the end of it, the characters are living with long-suffering longing and regret but are given a chance to make things right.

The one-minute teaser offers fleeting glimpses at the evolution of these relationships. You can see more when the film is released in theaters on Oct. 21 and on Prime Video on Nov. 4.

The titular policeman Tom is played by Styles in the '50s and Linus Roache in the '90s, while teacher Marion is played by Corrin in the '50s and Gina McKee in the '90s, and museum curator Patrick is played by David Dawson in his younger days and Rupert Everett in his latter days.

The film is directed by Michael Grandage from a screenplay from Ron Nyswaner. Greg Berlanti, Sarah Schechter, Robbie Rogers, Cora Palfrey, and Philip Herd serve as producers, while Grandage, Michael Riley McGrath, and Caroline Levy serve as executive producers.