- The arrival of a newborn girl causes the gradual disintegration of the Cairn family; particularly for 9-year-old Joshua (Kogan), an eccentric boy whose proper upbringing and refined tastes both take a sinister turn.
- The Cairn's life seems to be a harmonic family: The father Brad (Sam Rockwell) works as a stockbroker, his wife Abby (Vera Farmiga) takes care of their new-born daughter Lily (Kolb and Vill), and the nine-year-old Joshua (Jacob Kogan) is high-talented. But the appearances are deceptive. Joshua becomes gradually jealous that his parents give the baby more attention than him. As a result, he begins to terrorize his family.—RSaVLSG
- Following the birth of his sister, Joshua (Jacob Kogan), an impeccably dressed, soft-spoken, nine-year-old child prodigy, finds himself unable to cope with change. Not being the center of attention anymore, Joshua's frustration is increasingly growing; while his blissfully unsuspecting parents, Brad (Sam Rockwell) and Abby Cairn (Vera Farmiga), cherish every moment with tiny Lily (Kolb and Vill), the apple of their eye. But, the boy cries for attention; and, as mysterious coincidences and ominous signs of malice and methodical manipulation damage irreparably the already fragile balance of things, a quiet but sinister undercurrent of unease drags everyone down into its unforgiving depth. What is wrong with Joshua?—Nick Riganas
- The movie centers around the lives of Brad Cairn (Sam Rockwell) and Abby Cairn (Vera Farmiga), an affluent young stockbroker and his wife, raising children in New York City. Their firstborn, the nine-year-old Joshua (Jacob Kogan) is a frighteningly intelligent child - to such a degree that he thinks and acts decades ahead of his age. Nearly always clad in formal wear and demonstrating limitless brilliance as a pianist - with a marked predilection for "dissonant" classical pieces - Joshua gravitates toward his gay aesthete uncle (Dallas Roberts) as a close friend, but distances himself from his immediate kin - particularly when Abby brings a newborn baby sister Lily (Kolb and Vill) home from the hospital and unwisely alienates the young boy. As the days pass, one at a time, the mood at the house regresses from healthy and happy to strange, unsettled and disorienting; meanwhile, bizarre events transpire. As the baby's whines drive an already strained Abby to the point of a nervous breakdown, Joshua devolves from eccentric to downright sociopathic behavior, discarding all of his toys, disemboweling a stuffed animal, and killing off pets. Eventually, family members also begin to suffer tragic fates - but the question of whether or not they are Joshua's fevered and psychotic doings or merely the result of happenstance is not answered until the shocking conclusion.
In the last scene where the movie is concluded, it is revealed through a song that Joshua composes impromptu that everything was part of his plan to drive his parents away as he wants to live with his uncle Ned. Everything includes playing wrong notes in the piano, scaring the baby with a torch light at night, stopping his mother's psychological medications, killing the dog and his Guinea pig, taping himself scaring the baby so that his father gets to see it, killing his grandma Hazel (Celia Weston), forging drawings characteristic of abuse to drive the psychologists to the wrong conclusions, and deliberately misbehaving in public so that his father loses control and beats him (probably for the first time ever) in public, strengthening his case of abuse.
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