Joshua and Lauren are the perfect couple. Newly married, they're wildly in love, each on a successful and rewarding career path. Then Lauren is diagnosed with a terminal illness. As Lauren's disease progresses, Joshua struggles to make the most of the time he has left with his wife and to come to terms with his future—a future without the only woman he's ever loved. He's so consumed with finding a way to avoid the inevitable ending that he never imagines his life after Lauren. But Lauren has a plan to keep her husband moving forward. A plan hidden in the letters she leaves him. In those letters, one for every month in the year after her death, Lauren leads Joshua on a journey through pain, anger, and denial. As his grief makes room for laughter and new relationships, Joshua learns Lauren's most valuable lesson: The path to happiness doesn't follow a straight line.