The film begins with a loving family - George Farber (Tim Roth), his wife Ann (Naomi Watts), his son Georgie (Devon Gearhart) and their dog, arriving at their lake house. Their next-door neighbor, Fred (Boyd Gaines) is seen with two young men, Peter (Brady Corbet) and Paul (Michael Pitt), who seem to be their friends or relatives. The two young men come over to borrow eggs. Ann is in the kitchen cooking while George and Georgie are outside by the lake, tending to their boat. They seem friendly, and they use George’s golf club. When the men depart with the eggs they soon return with them broken. After asking for more eggs which also end up broken, Ann becomes frustrated, but when George tries to force the men to leave, Peter breaks George's leg with the golf club and they take the family hostage. Ann goes to call for help on the family's cell phone, but finds it unusable, having been earlier dropped in the sink by Peter. Paul then guides Ann on a hunt to find the family's dog, which he had killed with George's golf club. When the family's other neighbors arrive for a visit, Ann passes the two men off as friends until the visitors leave.