Some Sneaky Sim

Some Sneaky Sim is the only burglar that robs Sims' houses in The Sims. He will only try to steal the expensive items that are in the household. A Sim can call the police once he arrives on a lot, though they will probably not arrive in time to arrest him. If he comes within range of a burglar alarm, it will automatically summon the police. Unlike The Sims 2 and The Sims 3, he will surrender and go peacefully when the police arrive.

Most of the times, the burglar will arrive late at night. But at some point, he may rob the Sims when they are still awake. If one comes in the lot, Build and Buy mode are disabled, until the burglar is finished stealing your stuff. If Sims have a baby, there is a chance that he may take the baby with him. The burglar will spend his time stealing as many items as he can and escape before the cops arrive. If the police come after the burglar had robbed the Sims, they can't reimburse the loss. If they do, however, catch the burglar, they will receive §1,000; plus some extra money if he took some items. The police don't return the items however. Burglars are attracted to families that do not have dirty houses, and have wealthy items, such as a computer, or a television, but players can't actually predict when the burglar will come, nonetheless.

Sims cannot hold off the burglar even if they are awake. Trapping a burglar with fences or wall around him will not stop him from escaping as the burglar can teleport to make his way.