Muriel and her husband Lee are about to begin a bright new life, which is upended by the arrival of Lee's brother. Muriel embarks on a secret life, gambling on racehorses and discovering a love she never thought possible.

Muriel and her husband Lee are about to begin a bright new life, which is upended by the arrival of Lee's brother. Muriel embarks on a secret life, gambling on racehorses and discovering a love she never thought possible.