A British Intelligence officer is captured and forced to divulge information, after which he moves to the West Indies in shame.

All is not well on Hummingbird Hill, the King's are at their wits end. Their three children are full of mischief and trouble that desperate measures are needed. When an ad is placed in the paper, Lynn Belvedere responds, thinking that Lynn Belvedere is a woman, the King's are surprised yet pleasantly pleased by the self-proclaimed genius Mr. Lynn Belvedere, who takes on the task of looking after the King children. With a nosy busybody of a neighbor and jealous husband and a Boss who is not happy with the scandalous behavior of his employs family, all is still not well on Hummingbird Hill.

A young Englishwoman and her American husband become entangled when Audrey's divorced mother comes to visit, the girl's natural warning system begins buzzing. Audrey endeavors to keep her scheming mother from being reunited with her father, who has been perfectly happy since the split.