The Silent Thief is a 2012 gay psychological thriller movie about Brennan Marley a young man looking for belonging in a family. He takes on a photography trip to USA. He comes across a poster advertising an available room. He goes over to the advertised house and meets Candi Henderson the landlady. He is invited over for a meal with Candi's husband Howard Henderson and daughter Elise.
The room being rented out to Marley belongs to Mike their son who is off to college. Mike is coming over for Thanksgiving holiday and the family is excited. He eventually comes and the mother gives him a very emotional welcome. Marley and Mike are introduced.
Mike takes Marley to his best friend Alex. While there he tries to make Marley lift a weight but it almost injures him. Mike is upset and says to Alex that something is off about Marley.
One night Marley observes Mike leaving the house at night through the window. He follows him and finds out he is meeting Alex. He takes photos of Mike and Alex kissing. Now he knows Mike is gay.
Candi is emotionally unstable and whenever Mike leaves she is very upset while parking his stuff. Marley helps him out. He tells her that his mother died of cancer when he was young. Candi is very sorry for him.
Later in Mike's room Marley searches and finds a video tape hidden. It shows Mike and Alex conversing in a gay manner. He plans to keep it together with the pictures he took as blackmail against Mike.
Candi forces Howard to go fishing with Marley. While fishing Howard asks him if he has family back in London. Marley answers that his dad died in a plane crash while mother abandoned him.
Elise gets permission to go out with Marley for the night. She has a crush on him. She tells Marley that Howard was an American Football jock until he dislocated his shoulder. Mike was a star racing athlete until he hurt his knee. Elise explains she was a good swimmer but left it for marine science which dad did not approve of. He tells Elise that his family got hit by a drunk driver and drowned in the lake.
Meanwhile Marley begins training in weights and jogging. He wants to be as good as Mike in order to replace him in the family. He uses Alex's weights. Alex is gay and is attracted to Marley. One day he asks him to use his bathroom. He follows Marley into the bathroom naked and they begin kissing even though Marley insists he is not gay. Marley eventually hits him with his forehead unconscious and runs off.
Mike comes back for Christmas holiday. They go over to Alex's house and he is upset to see him hurt all over the face. Alex refuses to say what happened between him and Marley. Marley dares Mike to hand over the knife his dad bought him if he can lift a very heavy weight. Marley manages to lift it and Mike looses his knife.
Back in the house Elise comes into Marley's room at night and they have sex.
One day Marley prepares cookies especially for Mike. From the hidden video tape he learnt that Mike is allergic to peanut. He puts peanut butter in the cookies. Mike takes one and has a life threatening allergic reaction. He is rushed to hospital and Marley is left in the house hoping he dies.
Howard comes back from hospital together with Elise and Candi. Marley learns Mike survived. Howard orders him out even though Candi is against it. He is eventually allowed back but Mike is convinced he tried to kill him. Marley is now upset that things are not going his way.
Marley calls Alex faking to be Mike and asks they meet at the beach. There he hits him unconscious and drags him to the water. He ties him with rope to a marina pillar as the tide rises. Elise had tried to follow him and discovered he is up to no good. She wakes Mike up. Mike meets Marley outside the house and they get into a fight. Marley threatens to tell Mike is gay using the photos. Meanwhile Elise does an internet search of the names behind photos Marley has in his back. She finds all to be missing.
Marley forces Mike to go tell his parents that he is gay in order to know Alex's whereabouts. Mike does it and asks Marley to now tell him where Alex is. Marley is upset because the parents react calmly to Mike's homosexuality. They start fighting. Elise goes out to find Alex and rescues him from the rising tide. They come back home and manage to corner Marley. Howard orders all his belongings burnt. They then take him to the bridge and throw him into the river. He however survives and moves on.