One year, alone on his birthday, John sits drowning his sorrows in a hotel bar. Due to a twist of fate, he happens to start talking to a woman at the next table, and he discovers that they have one thing in common.

Paula is also marking her birthday alone. After a one night stand during which they share no personal information whatsoever, John and Paula come to a loose understanding: they'll meet in the same hotel bar on the same day every year, unless one of them has something better to do. No phone numbers. No social media profiles. Just an idea.

And then they go their separate ways. Or do they?

For the next ten years, John and Paula stick (more or less) to their agreement. As time passes, they begin to learn more about one another, despite their attempts to remain distant. And although he knows he should remain detached, John finds himself wanting to know more and more about the mysterious Paula. Some years she seems remote and disinterested, other years she's emotional and attached, and sometimes she seems half crazy. In fact, even though she looks the same, John starts to wonder if this is really the same woman every year after all.

Can one person really be ten different people at the same time? Or is something even more sinister going on? And is Paula connected to a series of murders in local hotels?