Color of Danger (Secrets of Rios Azules, #1)

Former runaway Mari Del Lobo works hard to save her struggling restaurant and to trust people again. Dallas surgeon Dr. Luke Goodman turns her world upside down with terrifying news. A recent murder has her late brother's - aka the Smiling Killer - signature and MO. When attacks on her escalate, Mari fights her growing attraction to the good doctor as fiercely as she fights for her life. To rescue herself and those she loves, will she be able to stop the murderer before he strikes again?

Luke couldn't save his fiancée from the Smiling Killer, but he'll do anything to prevent more murders, even ask help from the serial killer's sister. Finding a kindred tortured soul and the perpetrator's next target in Mari, Luke is determined to protect the stubborn ex-rebel. But Mari would rather face danger than risk the safety of the man she comes to love.