In San Francisco, Ben Cahill receives an overnight package from his only child who is studying art in San Miguel de Allende, the Spanish colonial jewel in central Mexico. It contains a suicide note chronicling four incidents leading her to take her lifeanone of which her father knew of. What could he do? What should he do? Most importantly, what would he do? The answer plays out in his crusade as investigator, judge, jury and executioner when necessary. Pursuing a presumed serial killer is another single father, Detective Diego Montoya of the San Francisco Police, who has trouble with his fourteen-year-old daughter. Cahill and Montoya cross paths often but only one knows of their secondary connection. Cahillas actions send Montoya scurrying down rabbit holes while he probes the lives of the people behind the noteas secrets. A game of cat and mouse ensues with only the cat knowing the rules.