The disappearance of a majestic Thoroughbred unites a community in 1930s India in "one of the greatest horse books ever written. . . . Moving, and highly original" (Lauren St. John, author of The White Giraffe).   In Calcutta, India, John Quillan cares for racehorses belonging to wealthy owners, and Mother Morag, who lives just down the road and leads a group of nuns working with Calcutta's poor, loves to watch these beautiful animals in action. Now, a new Thoroughbred, Dark Invader, has been shipped from England, rejected after a losing season, in which he didn't live up to his owner's expectations.   A beautiful creature with rippling muscles and satin skin, Dark Invader is gently handled with love in his new home, and before long, he is poised for victory in the Viceroy Cup, the country's most famous race. But just days before the event, he disappears--and a desperate effort to find him begins.   From Rumer Godden--the award-winning author of such classics as The Greengage Summer and Black Narcissus, as well as a number of beloved children's books--The Dark Horse is a moving and suspenseful story set in a fascinating historical era.