One of the main characters talks about his autism, reporting benefits from Dolphin Therapy he received when he was young. The question is whether she is an angel or a kidnapper and murderer. A character at the beginning of the story is an autistic boy named Raymond Gonzolas whose recovery is triggered by the main character. This is the book that was made into a movie with Paul Newman. The Boy With Penny Eyes.
Main character sounds autistic.
It is a horror novel. Originally published as The October Child. Part of the series Star Trek Starfleet Academy. Ages 9-12, Paperback, First of the series. I was told that the first three books of the Starfleet Academy series include an autistic character.