Released in late 1997, Home Alone 3 is a family comedy movie that comes as the third installment in the Home Alone series. However, in this sequel, the lead actor is no longer played by Macaulay Culkin, who played both Home Alone 1 and 2. Instead, the film stars Alex D. Linz. The story begins with a group of internationally wanted crooks named Peter, Alice, Button, and Earl who've just stolen a military chip designed to cloak missiles. Before they can deliver the chip to a North Korean terrorist organization who hired them, Peter and his three accomplices decide to hide the chip into a toy RC car to slip past security.
Accidentally, the toy car was switched with the same toy that was owned by Mrs Hess who just arrived in San Francisco. Without the slightest clue, Mrs Hess grabs the bag with the RC car in it, thinking it was hers, and splits. The 4 thieves quickly track where the chip is and find it in Chicago where the Mrs Hess lives. The group separates to cover each house in the neighborhood.
Meanwhile, Alex Pruitt, an 8-year old smart kid played by Alex D. Linz, is shoveling the snow from Mrs Hess' yard. After finishing, Mrs Hess decides to give the RC car to Alex as payment for his chore. Soon after arriving in his house, Alex begins to feel sick and later finds out that he has chicken pox.
Unable to skip work, her mom asks Molly and Stan to take care of their younger sibling while she works. Stan and Molly refuse and go to school. With Alex left alone, he decides to do some sightseeing at the attic. He then finds the four criminals and quickly becomes suspicious of their motives.
Alex immediately calls the police to respond. But before the police arrive, the group of bandits flee the scene, leading the police to think that Alex is playing a prank. Later, Alex finds the criminals again scouting the neighborhood. He decides to take the situation into his own hands. He installs a camera on an RC and attempts to film the thieves in action as they break in every house. Unfortunately, the tape was confiscated by one of the thieves, leaving Alex no proof to support his claims.
He then installs a variety of booby traps within the premises to protect him and the chip from being caught. Fortunately, the booby traps work and are able to subdue the criminals, which enable the police to respond just in time.