Rapture in Death by J. D. Robb
The alley was dark and stank of piss and vomit. It was home for quick-footed rats and the bony, hungry-eyed felines who hunted them. Red eyes glinted in the dark, some of them human, all of them feral.
Eve's heart tripped lightly as she slipped into the fetid, damp-edged shadows. He'd gone in, she was sure of it. It was her job to follow, to find him, to bring him in. Her weapon was in her hand, and her hand was steady.
Rapture in Death is the 4th book by J. D. Robb. Eve and Roarke are now married and the first death that occurs is at an off-planet resort that Roarke owns. They are sharing the 'honeymoon suite' and Eve is on vacation, but she has to pull on her 'cop' persona (which never really leaves her) and dig in. This book was published in 1996 and it is 21 years old now. The series is set in the mid-21st century - 2058 or so. There are futuristic elements for sure, but I find it interesting how many things mentioned are now, in 2017, at least possible or maybe even available. Sort of like the old 'Star Trek' show and the Engineer Scottie saying 'Computer...' or noticing those 'tricorders' in their hands. Doesn't it remind you of all of us gazing at our phones in our hands or saying 'Siri' or 'Alexa'. Curious, right? And the re-reading binge continues...
They died with smiles on their faces. Three apparent suicides: a brilliant engineer, an infamous lawyer, and a controversial politician. Three strangers with nothing in common—and no obvious reasons for killing themselves. Police Lieutenant Eve Dallas finds the deaths suspicious. And her instincts pay off when autopsies reveal small burns on the brains of the victims.
Was it a genetic abnormality or a high-tech method of murder? Eve’s investigation turns to the provocative world of virtual reality games—where the same techniques used to create joy and desire can also prompt the mind to become the weapon of its own destruction...