When twenty-year-old Jonathan Maguire wakes up in a pool of blood and with a dead body beside him, his shock and grief quickly turn to panic. Being arrested for murder will prevent him from fulfilling the promise he made to his parents - that after their death he would take care of Roger, his mentally handicapped older brother. Roger lives in a strange and complex world of his own creation - populated by millions of tiny insects - his insect farm. As the police move in, it emerges that Roger may know far more than he has revealed...