My contractor stolen money from my purse, what should I do?

[Anran Wang]

I hired a contractor to remodel my kitchen and I left my wallet there. When I came back to it within less an hour, they were gone and the wallet was open with the money gone. They and I are the only people who have access to the property. I know exactly how much money was there and when I called them, they were playing dumb. Should I confront them? What should I do? There are still unfinished jobs to do.