In this witty and charming love story, a buttoned-up math professor is forced to rely on her carefree doorman when her identity mysteriously disappears.

Catherine Lipton carefully calculates everything, and not just because shes a math professor. She had a chaotic childhood growing up with a free-spirited single dad. So now, from her daily to-dos to her afternoon snacks, Catherine has a plan for it all. But sometimes she wishes she could be someone else, someone with a totally different life. Until suddenly her entire identityfrom her Social Security number to her drivers license to her academic recordmysteriously disappears. Theres no evidence Catherine Lipton ever existed.

With no ID and no other options, Catherine reluctantly accepts help from her exasperatingly laid-backand infuriatingly attractivedoorman, Luca Morelli. Before long, by-the-books Catherine finds herself bending all the rules with the charismatic Lucafrom taking meetings in smoky bars to breaking into hospital record roomsand having a surprising amount of fun.

As Catherine unravels the truth behind her identitys disappearance, she may discover that the real Catherine has been missing for a lot longer than she realized.