Kill Signal (Marko Bell #1)

When a car plunges from the twisting coastal road just south of San Francisco onto the rocky cliffs below, homicide inspector Marko Bell is ready to chalk it up to a tragic accident. But when he finds out the deceased driver was the personal chauffeur for the mayor of San Francisco — and that he may have been forced off the road — Bell begins a dogged pursuit of the truth.
Bell's investigation takes him into the mansions of the city's powerful ruling families, the penthouse offices of the city's hottest young political consultant, and the streets of his adopted hometown. And it brings him into contact with two other cops, Karen Yancey and Shake Wingfield, who are investigating a decades-old series of unsolved murders. Together they uncover a massive conspiracy that powerful figures would kill to conceal. As Bell's pursuit brings him face to face with the haunting memories of his own personal tragedy, he is brought to the brink of obsession. All that's left is to identify the next kill signal — and to pray he's not too late to stop it.