Mission Canyon

Evan Delaney, novelist and legal go-fer, is dressed as Diana Ross in order to crash a fancy-dress party and serve a summons, when she hears that Franklin Brand is back in town. Brand is the hit-and-run driver who sentenced Evan's lover Jesse to life in a wheelchair, and killed his best friend.
Since the accident, Brand has been avoiding justice overseas; but if he's back Evan and Jesse are determined to get him, helped by the dead boy's brother, Adam. Brand has been a high-flyer in Mako Technologies, a cyber-security firm, and this is where Evan starts looking.
She quickly uncovers evidence that Brand was embezzling funds, and that Adam's brother knew all about it. So maybe the hit-and-run wasn't an accident at all? The policeman investigating is killed, and Adam and Jesse both come under suspicion.
Matters are further complicated by the confused emotions of Jesse who feels a survivor's guilt, and Adam who resents the fact that Jesse is alive while his brother died.
But there are more corpses to come - including a near miss for Evan herself - before the bad guys are finally brought to book.