A delightful blend of mystery and comedy, The Princess Comes Across follows Carole Lombard and Fred MacMurray across the Atlantic on an ocean liner, the S. S. Mammoth. Their fellow passengers include a blackmailer, a murderer on the run from the French police, and an international array of detectives. But Lombard herself has something to hide: posing as royalty, she is actually a native of Brooklyn with her heart set on a Hollywood film contract.