Claire O'Malley isn't looking for love. In fact, the woman she thought she would spend the rest of her life with just moved to Berlin. Claire's focus is on mending her broken heart. Not easy when you find yourself sharing a house with your ex's older sister, Kathryn Mercer.

The Kathryn that Claire used to know—frumpy and boring—has disappeared. These days she walks a little taller, looks a little slimmer, oozes charm and confidence, and turns heads.

Some things should be left alone. Some rules should never be broken. But some opportunities are just too good to miss.