When Vicki Maloney is randomly abducted from a suburban street by a disturbed couple, she soon observes the dynamic between her captors and quickly realises she must drive a wedge between them if she is to survive.
After hearing a child screaming for help from the green depths of a vast field of tall grass, Becky, a pregnant woman, and Cal, her brother, park their car near a mysterious abandoned church and enter the field, discovering that they are not alone and, for some reason, they are unable to escape a completely inextricable vegetable labyrinth.