NATIONAL BESTSELLER • From the best-selling, award-winning author of The Buddha in the Attic and When the Emperor Was Divine comes a novel that "starts as a catalogue of spoken and unspoken rules for swimmers at an aquatic center but unfolds into a powerful story of a mother’s dementia and her daughter’s love" (The Washington Post).The swimmers are unknown to one another except through their private routines (slow lane, medium lane, fast lane) and the solace each takes in the