Three close friends who have never left the outskirts of Dublin (much less Ireland) get the journey of a lifetime — a visit to Lourdes, the picturesque French town and place of miracles.

A nobleman with a literary flair, the Marquis de Sade lives in a madhouse where a beautiful laundry maid smuggles his erotic stories to a printer, defying orders from the asylum’s resident priest. The titillating passages whip all of France into a sexual frenzy, until a fiercely conservative doctor tries to put an end to the fun.