BLUE SHOE Mattie Ryder is a marvelously funny, well-intentioned, religious, sarcastic, tender, angry, and broke recently divorced mother of two young children. Then she finds a small rubber blue shoe-the kind you might get from a gumball machine-and a few other trifles that were left years ago in her deceased father's car. They seem to hold the secrets to her messy upbringing, and as she and her brother follow these clues to uncover the mystery of their past, she begins to open her heart to her difficult, brittle mother and the father she thought she knew. And with that acceptance comes an opening up to the possibilities of romantic love.  In a disarming blend of everyday life and the sublime, of reverence and irreverence, and of humor and grace, Anne Lamott speaks directly to our most closely held concerns, bringing comfort to anyone -all of us-whose family life can feel overwhelming and uncontainable.   Lamott's formidable storytelling gifts have gained her a large and passionate following, and anybody who has experienced the delightful humor and the canny understanding of her previous work will be similarly charmed by Blue Shoe.