Brain Trust — A.W. Hartoin

Coming home never felt so bad.
Mercy Watts and her grandad, Ace, survived the Sturgis Motorcycle Rally and are racing home ahead of a stalker whose plans for the Watts clan remain unknown.
But they're too slow and what Mercy finds at home spins her in a new and darker direction, taking her back out to her least favorite place on Earth, Hunt Hospital for the Criminally Insane. Soon she's sucking up to a serial killer and going toe-to-toe with a rogue rapist.
Mercy wants to hand this case off to her father, Tommy Watts, but the great detective is missing in action, just when his family needs him most. So it's up Mercy and her nerd crew and they're going to have to power through, battling the cops, the FBI, and a killer who has connections and no scruples.