Quadrille is a play by Noël Coward. The romantic comedy premiered in 1952 and starred Lynn Fontanne and Alfred Lunt. It played on Broadway in 1955, where Lunt won a Tony Award for his performance.
The date is 1873. The wife (Spencer) of Diensen, a railway magnate (Lunt) has run off to the South of France with Lord Heronden (Jones). Diensen and Lady Heronden (Fontanne) join forces to find their errant partners and get them back. They succeed, but are not glad to have done so because they have fallen in love with each other. At the end of the play, they elope together.