My father had a cleaner who used to take things, then it moved on to money. When he put his pension away in the desk whilst she was cleaning, and went back an hour and a half later to find it was gone, he challenged her, she denied it, but he showed her the door. Police not interested, his word against hers. But we later found she had also taken virtually all my mother's jewellery, worth thousands. Insurance paid up, but the loss was something you don't get over.
On the other hand we now have cat sitters living in the house when we go away, and so far have not lost a thing, and come back to a clean house and home made soup in the fridge!