The Toys of Caliban

An elderly husband and wife live in terror of their son, a boy who has the power to summon anything he can conceive. They are forced to limit what he sees and reads, since anything he summons has to come from...somewhere. When he becomes sick from eating too much summoned food, they take him to a hospital and attract the attention of a social worker, who doesn't know of the boy's power and is shocked at the parents' harsh treatment. The boy inadvertently kills his mother when he sees a picture of a heart in a magazine, and "summons" it out of her chest. Later, as the social worker comes calling, the boy demonstrates his power by summoning his missing mother...who has been two weeks in the grave. As the worker summons the police, the boy's father has him summon an explosion, killing them both rather than have his son fall into the hands of the government.