Lorenzo León Cortez and Josephine Rivers once shared a deep and wildly passionate love…until the day she left the key to his apartment on his nightstand and disappeared from his life. Shattered, he closed off his heart to love and vowed to never forgive her. Josephine left him because an unexpected pregnancy was not a part of their plan. Lorenzo had made it clear he never wanted to have children, and she did not want to burden him with the child she vowed to keep. She left the only man she had ever loved.

Years later, Lorenzo is contacted by Zoie, a cute and spunky twelve-year-old girl claiming he is her father. He is stunned to discover that her mother is none other than Josephine! What once was love is now war as he fights for joint custody, angered by Josephine never telling him she was pregnant with his child. Zoie instantly captures his heart…and against his better judgment, Josephine captures his eye.

As Lorenzo and Josephine learn to co-exist and co-parent, Zoie asks for one rule: her parents do not reconcile because she fears a breakup will lead to her losing the father she always yearns to know. There's only one problem. When they agreed to the rule, they were at war, and now that they have found peace, the passion they shared in the past has been sparked with even greater intensity, making them both tempted to break their one rule…