Sergeant Lindsay Boxer is used to murder scenes.
But nothing can prepare her when the victim is her former SFPD partner, Warren Jacobi.
A top detective until the end, Jacobi managed to leave Lindsay a clue.
The killer mounts a spree that strikes both coasts before returning to San Francisco.
Armed with little more than a dying man's last words, Lindsay must protect the people and the city she loves most.
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