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This macabre tale of mystery and murder concerns a withdrawn nine-year-old boy and his baby sister. His parents leave her in care of the boy when they go out, and the baby starts to cry. To stop the incessant crying, he puts her head in a plastic bag, removing it just before she suffocates. One time he leaves the bag on too long and the child dies. The panic-stricken lad hides the body and makes up a preposterous story about a strange intruder. The police listen to the yearn and determine the young boy to be the main suspect. He confesses and leads the authorities to the body, only to discover it has vanished. The police go away thinking the boy has nothing more than an overactive imagination...