Midnight guardians

"When Freeman is hired to investigate a conspiracy involving fake claims to Medicare, he quickly realizes the scheme is much more dangerous than anyone assumed."@en
"Max is back, trawling the trailer parks and waterways of south Florida, where amid the gorgeous beaches and abundant foliage there lies a stunning range of brutality. After Max is hired to investigate a conspiracy involving fake claims to Medicare, he quickly realizes the scheme is much more dangerous than anyone assumed. And when the Brown Man, a former drug kingpin who once helped Max nab a serial killer, reappears in a slick new guise, Max must reclaim his street instincts to protect not just the citizens of south Florida, but also his girlfriend, Detective Sherry Richards, the one person he can't afford to lose."