After the tragic death of Butch Browning's wife, four families begin to realize how precious their time together is. Butch is facing single parenthood. The O'Reillys are expecting their first child. The Andersons are approaching an empty nest, and the Buckleys are so focused on their children that they've forgotten what they truly need. With just eighteen summers before their children are grown, how do they make the most of that time?
