Wyatt Forrester is a soldier. One of the best. But when a mission went wrong, and he lost a close friend, he went home to clear his head.

His beautiful and meddlesome best friend Penny wants to help him remember who he was. She makes a list of every dumb thing they did that last summer after high school and they’re going to work their way through it.

But at the end of that long-ago summer, he asked her to be his, and she turned him down. This time, will they have a different ending?

Penny Edgecombe was a wild teenager, but that’s behind her. Her life is focused on raising her five-year-old son and running the Ferns and Friends gardening center.

Her mom would like her to find a boyfriend or—better yet—a husband, but Penny isn’t interested. Her parent’s marriage was terrible and she’s not going to repeat their mistakes. She keeps her relationships light and easy, never letting anyone get close.

The only man she’s ever let into her heart is Wyatt, and they’re only friends. But her list pushes their friendship into passionate territory and she has a hard time not dreaming of their relationship lasting longer.

Penny thought she was the one helping Wyatt, but maybe he will be the one to help her open her well-guarded heart.

They both have to confront the ghosts in their pasts. Then they have to decide if they’re brave enough for the greatest adventure of all—true love.