From the description:
"Michael Knight and Lex Devlin agree to defend a jockey accused of murdering a fellow jockey during a race at Boston's Suffolk Downs. Michael's expertise in the machinations of the horse racing game is expected to serve them well. But a personal attachment to the murdered jockey thrusts Michael and Lex into the midst of conflict between Boston's Irish mafia and remnants of the terrorist branch of the Irish Republican Army. As Michael and Lex uncover layer after layer of deceptions involved in the seamier side of horse racing, they become more dangerous to the gangs. In action that shuttles between Ireland and Boston, the lives of the lawyers as well as those close to them are in the gravest danger and the criminals show no mercy in their quest to put an end to this threat."
This mystery gets an impressive 4.8 stars (no negatives) from 23 reader inputs. WhisperSync for voice enabled.