Often mocked as a “water cop,” EPA special agent Sophie Grant has faced countless dangerous situations while chasing criminal polluters, from boarding tankers at sea to Somali refugee camps. But when she is assigned to Italy’s tourist-filled Amalfi Coast in pursuit of a toxic-waste-dumping cartel, she finds herself in the crosshairs of legendary Camorra assassin Il Mezzanotte Ramingo-the Midnight Rambler-and is forced to do the most harrowing thing of all: ask her disgraced ex-cop father for help.

But like the deadly polluted water flowing below the sun-splashed Amalfi bedrock, nothing is as it appears. The CIA aims to use her as bait. But Il Ramingo hasn’t killed seemingly impossible-to-reach politicians, judges, and Camorra rivals for years without learning to sniff out a trap.