Loss.

Loss is a strong theme running throughout "Forgotten." Loss touches each of the characters in their own way.

London's loss is literal. She has lost her memory. She has also lost her brother and father, but these losses aren't known to her until the end of the book. How London deals with her losses is what drives the book. Her inability to deal with the loss of her brother sparks the memory loss which governs London's behavior during the book. Her personality has formed around her loss of memory.

London's mother has suffered the loss of her son and the loss of her daughter as she knew her. When London loses her memory she becomes a different person than the one her mother has known. Bridgette's reaction to loss prevents London from making realizations about her own life.

Although a secondary character in the novel, London's father is...