When Ellie awoke with an epic hangover the day after she caught her boyfriend cheating, it wasn’t the pounding in her head that caused her to scream. It was the discovery of the late-night message she sent to the boy she loved ten years ago. The one she had a whirlwind summer romance with in Door County for one week when she was eighteen and hadn’t seen since. The boy she gave her heart to and forgot to take it back. You know... “The Big One”. After Ellie and Liam reconnect online, and the years haven't diminished their chemistry one bit, a few martinis and her meddling wingmen convince her to hop on a plane to surprise him... in Italy. When she sobers up somewhere over the Atlantic Ocean, she regrets her decision to drop in on him unannounced, but then she sees the boy she loved standing in front of her as a gorgeous man, so she puts her fears aside to find out if he's still the one. Ellie ends up on the journey of a lifetime finding out if she met her soulmate at the ripe old age of eighteen, or if she needs to swear off the trouble-inducing booze for good.