Elwood P. Dowd's constant companion is Harvey, a six-foot tall invisible rabbit. To his sister, his obsession with Harvey has been a thorn in her plans to marry off her daughter. However, when she decides to put Elwood in a mental institution, a mix-up occurs, and she finds herself committed instead. It's now up to Elwood and "Harvey" to straighten out the mess.

The Victorian wife of a mad baron waits years for a British soldier sent to Egypt.

When ex-con artist Harry claims that a secret treasure is hidden inside Candleshoe, an English estate, he creates an elaborate plan to find and steal the prize. By convincing a girl named Casey to impersonate the estate owner's long-lost granddaughter, Harry hopes to uncover the treasure's location. But when Casey has a change of heart, she must follow the clues and find the treasure, in order to save Candleshoe and stop Harry before it is too late.

Russian exiles in Paris plot to collect ten million pounds from the Bank of England by grooming a destitute, suicidal girl to pose as heir to the Russian throne. While Bounin is coaching her, he comes to believe that she is really Anastasia. In the end, the Empress must decide her claim.