
Two couples- one old and the other young. The old couple has an equally old bachelor friend. The husband is always worried that his wife and the aged friend are a little too fond of one another.
The other couple, despite being very much in love, get involved in a situation because of which each partner begins to suspect the other of being unfaithful.
Add to the situation a few funny characters and a couple of villains, and you have plenty of comedy and drama going on.