Therese Crutcher is not a risk taker. Through meticulous planning, she eliminates as much uncertainty from her life as she can. Yet during her senior year of college, blithely planning to marry her beloved John Marin, she is suddenly thrown into turmoil when John's sisters announce they finally know what killed their mother, Huntington's disease. John and his three older sisters have a fifty-percent chance of inheriting Huntington's, which slowly kills the brain cells that affect movement and cognition. John says, "You never know what will happen in life," but his at-risk status shakes Therese to the core. How can she live with such uncertainty? Eventually, Therese takes the biggest gamble of her life and marries John. All four Marins choose to ignore what they cannot change; and in the early years, John and his sisters--a big part of Therese's life-- remain healthy, fun-loving, and as close as ever. When she observes symptoms in Lora, the oldest sister, Therese fears that Huntington's has found her. And when Marcia is diagnosed with the disease, Therese--with two small children, a career, and a husband now in the prime age range to show symptoms--struggles against the demons that feed her fear.When Marcia's symptoms worsen, Therese lovingly oversees her care. Several years later, Cindy, the youngest, also develops Huntington's, and Therese does the same, feeling that managing the care of these loved ones is the greatest gift she can give them.Thus unfolds a life filled with unpredictability, tough choices, and pain, and yet full of love, good times, and great joy. Therese comes to realize that the uncertainty she willingly took on has opened her heart to love more deeply; that acknowledging her world could change overnight has made her life richer. She has learned to overlook shortcomings and to compromise, to let go of anger, to find joy in the simple things. And though John's sisters leave this world far too soon, the Marin siblings, she realizes, have taught her about embracing life, forgiveness, and unconditional love.