Stephen Kalyn has joined the cast of the upcoming psychological thriller sequel The Housemaid's Secret, starring alongside Sydney Sweeney in the next installment of the blockbuster franchise.
The 28-year-old actor, who recently starred in the 2026 Prime Video teen series Off Campus, will play Brock, the new boyfriend of Sweeney's lead character, Millie Calloway.
The casting was announced on Monday, August 31, in a video published on the film production's official Instagram profile. The official publication welcomed Brock back, stating that Kalyn had joined the cast of The Housemaid's Secret and that the film will open in theaters on December 17, 2027.
A worldwide hit
The Housemaid's Secret is the direct continuation of the 2025 movie The Housemaid, which became a worldwide box office success upon its release last year. The films are adaptations of the bestselling thriller trilogy written by American author Freida McFadden, whose novels have gained a massive global following.
Sweeney, 28, reprises her role as Millie, returning to a character that helped cement her status as a leading cinematic star. The actress is also known for her Emmy nominated television work in HBO's Euphoria and The White Lotus.
Kalyn joins the expanding cast after gaining recognition for his performance as Dean Di Laurentis in the television adaptation of Off Campus. He will act alongside a supporting ensemble that includes Hollywood veterans Kirsten Dunst and Brittany Snow.
The locked door
The sequel adapts the second book in McFadden's saga. The plot once again follows Millie as she takes on a new job working as a domestic employee for a wealthy household.
When she is hired by the new family, Millie is given an unusual condition for her employment: she is told that she can never meet the lady of the house, Wendy Garrick.
Dunst, 44, has been cast as the reclusive Wendy. The Academy Award nominated actress brings decades of experience to the role, having starred in critically acclaimed films such as The Power of the Dog and Melancholia.
Wendy's husband, Douglas Garrick, will be played by 37-year-old actor Paul Anthony Kelly. As Millie settles into the job, the strict rule about avoiding her employer begins to raise her suspicions, eventually leading her to discover what the production describes as a dark reality hidden behind a locked door.
Snow, 40, will portray Marybeth, who is described as an apparently discreet receptionist working at Douglas Garrick's company. The actress is best known for her starring role in the Pitch Perfect musical comedy franchise.
