Twenty-eight-year-old Sydney Smith decides that it’s time to move out of her tiny apartment and become a home owner. After she sets up a time to see a duplex house, Sydney’s surprised to see a male realtor instead of the female one she talked to on the phone about the property. But really, why care when he’s one good-looking specimen of a man?
After introducing herself, Sydney learns he’s Blake Smith and also wants to see the house. Both have the same plans of renting half of the duplex to friends. When the realtor arrives, the couple learns that the receptionist made a mistake in scheduling due to their same last name, assuming they were husband and wife.
While looking at the duplex, sparks fly instantly between Blake and Sydney. They both fall in love with the duplex and want it. After the showing, Blake invites Sydney out to dinner to discuss their problem. He suggests they both buy the duplex, together. She can live on one side and he'll take the other side. Blake thinks having a woman close by will be beneficial for his young son, Noah. Sydney realizes Blake makes a good salary as an engineer, so he’s definitely not trying to get a house cheaper by splitting the cost. Blake learns she writes a column called “Sydney’s Sassy Suggestions to Singles.”
Although buying a duplex house with Mr. Hottie Engineer seems crazy, Sydney decides to think about it. Before making an offer on the house, Blake and Sydney spend time together to learn more about each other and to discuss if they can live under the same roof. Blake mentions they must have a platonic relationship because of his young son. Blake worries it might be difficult to have a sexless relationship with the attractive and sexy columnist. Even though they'll live in separate units, the temptation will exist on a daily basis. The present owners have a door adjoining the two sides because of their adult daughter and her children sharing the duplex.
Sydney’s already hot and bothered just looking at Blake. She suggests writing rules so sharing a duplex can work for the three of them.
The rules are excellent, but that adjoining door between the two sides creates havoc one stormy night. Their hot night might have been avoided if rule number two had been followed. And what are they going to do about those rules now?