The Sims 4's burglar is called Robin Banks and will show up during the night, when your Sims are happily sleeping. She'll sneak into their home and grab any valuables she can find before quickly ...
The Sims 4 officially confirms that Burglars will be making a return to the game, being introduced in the next patch for the life-simulation game.
A handful of other Sims 4 expansions include unique interactions for the burglar. For example, if you own the Cats and Dogs pack and have a dog in your house, they might chase Robin out.