There were no warning signs. Springtime in Israel, the day after the Passover Seder, a kibbutz guesthouse, sunny and peaceful. Maya, a couple's therapist who researches the secrets of memory, didn't want to spend the Passover holiday there. She knew that place was like an open wound for her mother, but the pastoral landscape did her good, and she's enjoying herself with her husband and three children, at the beach. When her middle son waves...