Susannah Dean is a character in The Drawing of the Three, the second in The Dark Tower series by Stephen King. Susannah is a double amputee.
From the publisher:
After his final confrontation with the Man in Black in a remote mountain Golgotha, an exhausted Roland awakes on the beach of the Western Sea and is immediately attacked by a shoreline monster known as a lobstrosity. Roland kills the clawed creature, but not before it bites off two of his fingers and half of one big toe. Fighting off the delirium brought on by the lobstrosity’s poison, Roland forces himself along the beach where he discovers three freestanding doorways that lead into our world.
UK publisher: Hodder & Stoughton (2003)
US publisher: Donald M. Grant (1987)
Author represented by: Chuck Verrill of Darhansoff & Verrill