Cause and Defect

While out playing with his brother, eight-year-old Michael strays onto a derelict farm. It would be the last thing he ever did. But how did Michael die? Falling through the roof of an old shed? After finding Michael's body, eleven-year-old brother Zack is in no doubt: Michael was savaged to death by evil chickens. Is this just the product of Zack's distressed mind, a random event, or is there some cause and effect at play that nobody wants to be made public?