that movie where a milf is cheating with a younger guy and the shack collapses, revealing them

Connie is a wife and mother whose 11-year marriage to Edward has lost its sexual spark. When Connie literally runs into handsome book collector Paul, he sweeps her into an all-consuming affair. But Edward soon becomes suspicious and decides to confront the other man.

In this society drama set in contemporary England, a noblewoman pretends to be an adulteress in order to protect her sister-in-law, who actually is.