Brahms Heelshire is the titular main antagonist of the 2016 psychological horror thriller film The Boy. He is the son of wealthy family called Heelshire, and a serial killer. His parents faked his death to protect him after he killed his friend when he was 8, leading him to live in the walls of the home for 20 years. His parents left Brahms with a “nanny” as a parting gift so that they could kill themselves while making sure he was cared for. He occupied himself by stalking his nanny Greta, moving the doll (that was supposed to portray him as a child) around the house.
He was portrayed by actor James Russell, while his young version was played by Jett Klyne.
As an attempt of escaping her abusive boyfriend back in the United States, Greta accepts a job as a temporary nanny to an English family by the name of the Heelshires. She is then introduced to the married couple's son, Brahms, who turns out to be a life size porcelain doll. Supposedly, the real Brahms perished in a fire 20 years ago, and he had apparently rejected several nannies prior to being introduced to Greta. As Mr. and Mrs. Heelshire were leaving for their vacation, Greta is given a list of rules to follow in regard to their son.
Greta predictably ignores the rules, and as a result, mysterious events start to happen. Brahms would seemingly move on his own, and he would disappear and reappear anywhere in the house. She eventually starts to believe that Brahms' soul was inhabiting the doll after she was given a peanut butter-and-jelly sandwich. Malcolm, the Heelshires' grocery boy, tries to convince Greta into leaving the house by telling her that the real Brahms presumably murdered his childhood friend by the name of Emily Cribbs back in 1991 before dying that very night, but she refuses. Meanwhile, the Heelshires write a goodbye letter to their son, and they then drown themselves by walking into a river.
One evening, Cole, Greta's ex-boyfriend, makes his way to Heelshire household, fully intent on forcing Greta to return to Montana, by force if necessary. To help deal with Cole, Malcolm decides to stay nearby, while Greta appeals to Brahms for help. Cole finds a message in blood telling him to leave; believing either Gretta or Malcolm did it, Cole angrily snatches the doll and destroys it.
Immediately afterwards, the house begins to shake, and the lights flicker. Cole investigates a mirror in the room, which shatters open. An adult human Brahms, wearing a porcelain mask, then comes out of the wall. It is then revealed that Brahms has been alive all along, having been living within the house's walls. Enraged at the destruction of the doll, Brahms attacks the group and kills Cole, stabbing him with one of the broken shards of the doll. Malcolm and Greta then flee with the angry Brahms following them.
After escaping to the attic, they finds photographs of Brahms' childhood friend, as well as her missing dress and jewelry. Greta learns that Brahms was actually moving the doll to give the illusion that it was alive. To her horror, she figures out that the Heelshires had offered her as a sacrifice to Brahams for his "keeping" as they did with previous nannies. Greta and Malcolm attempt to escape through a small passage, but only Greta succeeds when Brahms knocks out Malcolm with a baseball bat. He threatens to kill Malcolm if she leaves, forcing Greta to come back.
After arming herself with a screwdriver, Greta uses Brahms' strict rules against and coerces him to go to bed He asks for a good night kiss, which she begrudgingly accepts. Brahms then tries to pull Greta in and make out with her, at which point she stabs him. Brahms then gets out of the bed and attempts to strangle her. Greta stabs Brahms further until he lets go and drops to the floor, the stabs presumably killing Brahms. She escapes the estate with Malcolm, leaving the gate doors open in the process. The film then ends with a hand rebuilding the doll, implying that Brahms is still alive.
- He mentions briefly that he had murdered other nannies that were assigned to him prior to Greta.