Regina's Song

Regina's Song, written by David and Leigh Eddings, is a murder mystery novel, with some fantasy themes present as well.

Regina and Renata are so identical that after their infant footprint records are lost, no one is certain which twin is which—even their own parents.

She attends the same college as Mark, a family friend and surrogate big brother, who juggles his own course schedule and teaching responsibilities.

Mark and his friends (Sylvia, Erika, Trish, James, and Charlie) eventually realize that Renata is responsible for the murders and is hunting down her sister's killer.

Once she accomplishes her goal, Renata has a complete psychological breakdown; she does not know who or where she is, and she speaks exclusively in a secret language that the twins had invented when they were young.