When Ireland's famed Blarney Stone goes missing, American insurance investigator Joe Mulqueen (Bing Crosby) flies across the pond to get a better look at the crime. But in the process, he falls in love with a local lass (Ann Blyth) ... and fulfills an ancient prophecy. Hume Cronyn co-stars in this lilting movie-musical that finds the leads making eyes at each other over the title track, "Top o' the Morning."