 Now noisy construction work drives Steve crazy at Mark s beach-house, he decides to move out, making his dad nostalgic. When Jesse s girl friend Lana dies in the pool of a fully computer-controlled house after disregarding a warning to keep out, Steve considers domotics both for his criminal and residential searches. Bruce Locatelli, the creator-CEO of the model which killed, suggests but refuses to say formally that his competitor Donald Purdy deliberately sabotaged his system by reprogramming it via the  backdoor . Mark finds out about Locatelli s past, but then he dies in an accident involving his own system at home; however it appears he may have planned to be saved by his maid who was held up by an exceptional traffic queue. Then the other doctors learn Locatalli may still be killing by pre-programming, and could have done so in Steve s new home, where Mark is indeed locked inside...