American comedian Bob Temple has a reputation for being a perfect gentleman with the ladies and therefore, a perfect bore.  Consequently, although Bob is in love with leading lady Diana Wilson, she seems to be interested in him only as a friend.

With the encouragement of his butler, Rochester, Bob decides to rebel against his "safe" reputation and, while in London, begins a clumsy pursuit of the beautiful Lady Arlington, unaware that she is married.

For her part, Lady Arlington is a neglected wife, and through the urging of her French houseguest, Mme.  Dubois, invites Bob to a weekend party at her estate, hoping to instill jealousy in her husband John.  The ruse succeeds, and not only does John become jealous, but so do M.  Dubois and Diana after John reveals that he saw Bob kiss Mme.  Dubois.

As a result, both husbands arm themselves with pistols, and accompanied by an angry Diana, confront Bob during his opening night performance.  He is saved, however, when Rochester appears with a baby and pretends that it is Bob and Diana's legitimate child.  Lady Arlington then confesses that the alleged affair was all her fault, and thus saved, Bob and Diana are finally able to pursue their love for each other.