With the sun not only setting on summer, but also on the fourth year of Brett and Austin Tanner's relationship, the couple couldn't be happier. With a young son and a daughter, they're enjoying life together in the affluent suburb of Old Greenwich, Connecticut while Brett continues working at Goldman Sachs in Manhattan. When Austin takes on a new writing project during her pregnancy with their third baby, she readies herself for a challenging few months. Woken in the middle of the night, the startling news of a fatal car accident sends Brett's world spinning out of control. Overwhelmed with heartache and sorrow, Brett is unable to cope with his grief. Baby Gederick joins the Tanner circle when Brett and Austin are appointed as the Guardian to the little boy who is a physical reminder of the dear friends they've lost. Struggling to cope, Brett's behaviors leave Austin with a house full of children to care for as she works to help the love of her life deal with both his obligations and his pain. Loyalty and unconditional love persevere as this sexy and successful couple weather the challenges of life, love, loss, and marriage.