Brainy bellhop Buzzy O'Brien (Frankie Darro) tries his hand at sleuthing out a killer when a hundred thousand dollars in bonds disappear and the corpse of Bank Vice President Thaddeus Porter is left in their place. When Kitty Monahan (Sheila D'Arcy), the object of Buzzy's affection, is named as the lead suspect by flat-footed Detective Lanahan (Dick Purcell), Buzzy spirits her away to his mother's apartment where the feisty old Irish battle-ax comically combines courting with crime solving.
Featuring comic turns by Lillian Elliot as Buzzy's Mother and Mantan Moreland as Buzzy's Hotel sidekick, Irish Luck is a whimsical whodunit filled with romance, thrills and just a touch of blarney.