Make Them Sorry (Camaro Espinoza Book 3) - Sam Hawken

Camaro Espinoza is 'the deadliest female protagonist since Jon Land's Caitlin Strong and Stieg Larsson's Lisbeth Salander' (Booklist). Camaro doesn't particularly want to get involved with other people's lives, other people's problems. But she can tell that the woman in her gym is looking for help. And when she learns that Faith has a stalker, she agrees to give her a few defense lessons. She's not expecting the stalker to become so violent so quickly. Or to have been hired by someone. Faith, it seems, has made some serious enemies... and now they're going after Camaro too. They're about to find out that that was a mistake.