Murderous Malevolence

The novel is mainly a noir-type crime thriller involving homicides, human trafficking, organized crime, terrorists, and courtroom legal dramas, but it does have a paranormal angle. Scot is a troubled teen in an orphanage on probation for car theft. He grew up in the ghetto, involved in criminal activities to survive. He's shot in the head during a mass school shooting. Scot wakes up able to see and hear earthbound souls, and many of them come to him seeking justice for their murders.
One of those souls is a murdered FBI agent named Sharon. Scot helps Sharon get the serial killers, human traffickers, and terrorists as he works with certain state, federal, military, and other lawful organizations to catch the bad guys and save victims. In exchange, Sharon helps Scot cheat at gambling-cards in high-stakes poker and blackjack games for money. Together they take down a lot of predators, but Scot pays a heavy toll along the way, being repeatedly wounded and prosecuted for some of his vigilante actions.
He also falls in love for the first time with an FBI agent he partners with. This is an action-packed crime noir novel with an intriguing paranormal slant.