I am looking for the name of this movie (i think that was a movie at least and not an episode from series)

A wealthy business man and his wife are hosting a celebration dinner. He invited his some of his important employees but the night turned into something else when he could not find the treasured object for the night in his safe. I cant remember what exactly that object was but it was very important and smth that a rival company also wanted to get his hands on. The business man suspects everyone, including his wife, and locks them all in a glass room. He will only release them all once one of them admits stealing that object from his safe. He is also using a deadly gas in that room so his prisoners can tell the truth as soon as possible. I cannot remember the rest very clearly but at one point, the wife of the businessman locked him in that glass cage/room as well and asked for their anniversary date so he can release himself but he could not remember it.

I hope someone knows the answer to my question and hope it was still understandable with my english.

Thank you in advance :)