Hidden: A Gritty Hardboiled Serial Killer Thriller. Ash Park, #5

Detectives face off against a brutal serial killer kidnapper in this dark and intense hardboiled crime thriller.  A gruesome crime. A vicious predator. And a detective on the verge of losing everything."Creepy and haunting...a fully immersive thriller." ~New York Times Bestselling Author Andra Watkins HE'S BACK. Detective Edward Petrosky has always felt the pain of the world like a razor blade in his gut, even more so when he considers the killers who have escaped conviction.
But he can't let that stop him, not after a grandmother is found murdered on her front lawn, the victim of some machete-wielding psycho. The case is strange from the outset: no one heard a thing despite the public nature of the crime. An unknown child's footprints cover the property without a trace of the kid. And a grisly discovery in the basement has the entire police force stunned. Nothing makes sense.
Whatever secrets their victim had, she'd taken them, quietly, to her grave. But when another woman's corpse turns up with a familiar brand on her ribcage, Petrosky realizes the horrible truth: a killer he'd thought was long gone from Ash Park has remained, lurking in their midst. And who knows how many victims this butcher has collected? For those he's kidnapped, any day might be their last, imprisoned, unseen, with only their screams and a deranged lunatic for company.
Now Petrosky must risk everything he holds sacred to track the most sadistic killer Ash Park has ever seen, a man whose thirst for carnage extends far beyond mere bloodletting. But saving innocent lives will require an unbearable sacrifice. One from which he may never recover. Hidden is the emotional fifth book in the hair-raising Ash Park series, though all novels in the Ash Park world can be read as standalones.
If you like Chelsea Cain, Karin Slaughter, or Paula Hawkins, you'll love Ash Park.