Theo and Kit have been many things to each other: childhood best friends, first loves, soulmates, and now, just estranged exes. After a heated breakup during their transatlantic flight to their dream European food and wine tour, they cut ties for good.

Time apart has been a healing journey. Theo has found his stride as a confident bartender by night and a budding sommelier by day, enjoying a series of no-strings-attached relationships. Kit, who never returned to the States, has earned the title of "sex god" in his pastry school and now works at one of Paris's top restaurants. Sure, life feels a bit lonely, and no one really compares to what they once had, but that's in the past, right?

The only thing left is an unused voucher for the European tour they never got to take, set to expire in just a few months. After four years, Theo decides to finally use it, planning to go alone. But fate has other plans. When they board the tour bus, they discover they've both unknowingly booked the same trip. Now, they're stuck together for three weeks, traveling through France, Spain, and Italy—surrounded by breathtaking landscapes, mouthwatering food, and the romance of it all.

It’s no big deal. They’re completely over each other. So much so that when Theo jokingly challenges Kit to a hookup competition with their attractive Italian tour guide, Kit happily accepts. Why stop at one? They turn it into an all-out European conquest to see who can sleep with the most strangers.

But sometimes, after sampling everything else, you realize that the one thing you want is the one you can't have.