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Ellen Raskin
Ellen Raskin was an American children's writer and illustrator. She won the 1979 Newbery Medal for The Westing Game, a mystery novel, and another children's mystery, Figgs & Phantoms, was a Newbery Honor Book in 1975.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The Westing game
2003
ISBN 9780525471370