Rachel Simon's sister Beth is a spirited woman who lives intensely and often joyfully, despite her intellectual disability. Beth spends her days riding the buses in her Pennsylvania city. The drivers, a lively group, are her mentors; her fellow passengers are her community. One day, Beth asked Rachel to accompany her on the buses for an entire year; the book is the chronicle of that remarkable time. Rachel, a writer and college teacher whose hyperbusy life camouflaged her emotional isolation, had much to learn in her sister's extraordinary world. Here are life lessons from which every reader can profit: how to live in the moment, how to pay attention to what really matters, how to change, how to love, —and how to slow down and enjoy the ride.

Simon elegantly braids together riveting memories of terrifying maternal abandonment, fierce sisterly loyalty, and astonishing forgiveness. She brings to light the almost invisible world of mental retardation, finds unlikely heroes in everyday life, and portrays her very special sister Beth as the endearing and indomitable person she is. This heartwarming book takes the reader on an inspirational journey, at once unique and universal.