Last Voice You Hear — Richard B. Schwartz

A California congressman is impaled on an escalator in a London tube station and a big-shot real estate agent is poisoned on a Disneyland ride. Unusual sword-like murder weapons, public settings, and expert execution connect these two brutal homicides. Worlds apart from the sloppy street crime he usually deals with, LAPD lieutenant Frank White can't help admiring the killer's precision and perfect planning. But with no witnesses and little evidence, how can he solve this far from ordinary case? With help from his best friend, private investigator Jack Grant, he uncovers a sordid connection between the victims and a heinous crime never brought to light.

The division between right and wrong is blurred in this twisting tale of vengence and deadly justice.