From the restaurant's website:
"The Safe House in Milwaukee is one of a kind, unique, difficult to describe! Many say this spy haven can be only be experienced, not defined. It's licensed to thrill!"
Kids' menu. Full bar. Serving lunch Fri–Sun, dinner Tue–Sun. Closed Mon.
"It can be a bit tricky to get into the Safe House, a spy-themed restaurant and bar in downtown Milwaukee. But don't let that stop you, because the joint is worth the hassle. A few tips: the establishment is in a building marked International Exports, Ltd., and you need a password to get inside. (Ask a local before you go.) If you don't know it, you'll have to perform a silly trick to get in."
— Forbes Travel Guide