A Dance in Moonlight — Sherry Thomas

Welcome to Doyle's Grange, a charming house near the hills of Exmoor, where the garden is beautiful in every season, and the residents are respectable year-round.

Except when the clock strikes midnight...

After losing her childhood sweetheart to another woman, Isabelle Englewood is heartsick. But then something remarkable happens: Upon arriving at Doyle's Grange, her new home, she meets Ralston Fitzwilliam, who looks almost exactly like the man she cannot have. Come late at night, she tells him, so I can make love to you pretending that you are the one I love.

Little does she realize what she is about to unleash...