Black at Heart (Black CATs, #3)

As her mentor and boss, Wyatt Blackstone resisted a relationship with Lily Fletcher, the fragile woman whose technical skills helped him track countless internet predators. The murder of her nephew by a paedophile and the subsequent suicide of her sister left her entirely alone in the world. When she took it upon herself to launch a personal crusade against an internet predator, she nearly paid for it with her life. A year later, she's preparing herself to come face to face with her two enemies - the man who killed her nephew and the attacker who nearly killed her.