Natalie and Tom have been best friends forever. But Tom wants more, and he’s going to prove to Natalie that they were meant to be together. He makes a wildly romantic proposition: spend 26 weekends together, indulging in a different activity from A-to-Z. In six months, he argues, they will be desperately in love. The cautious Natalie—still heartbroken over her ex-boyfriend Simon—isn’t so sure.

But Tom and Natalie aren’t the only ones coping with the vagaries of love. Natalie’s mother is going through her own crisis, and Lucy, Tom’s unhappily married sister-in-law, yearns to give in to temptation. All of them are about to learn that no matter how clever they are, love—and life—isn’t always as easy as A, B, C . . .