Because he does not want to lose feminist Suzanne Ercoll, lawyer Foxcroft Grey unhappily accepts her proposal that they marry but live together only from Saturday until Monday, leaving each free to live as he pleases the rest of the week, no questions asked. On their first Monday morning together, after Suzanne leaves Foxcroft's apartment, Foxcroft helps his upstairs neighbor Charlie Hamilton, who after an all-night party dared Dot Harrington to stay and cook breakfast, to get Dot out of the building without being seen. Suzanne returns shortly after and sees Dot coming out of Foxcroft's bedroom. When Foxcroft says nothing, Suzanne tries to make him jealous by arranging for him to find her in a playwright's bungalow, but Foxcroft sees through her scheme and remains unmoved. After a feminist delegation presents Suzanne with an award, Foxcroft finds her in tears wanting to end the arrangement, and they begin to live conventionally.