Monk and Natalie are approached by Linda Kloster, wife of renowned chess grand master Patrick Kloster, who she believes is planning to murder her for the insurance money. Monk makes a promise to her that he won't let Patrick get away with the crime. Subsequently, Linda is found dead of an apparent heart attack in her bedroom, though Monk immediately suspects poisoning. In trying to find evidence to nail Patrick, Monk finds himself facing off against a foe who is much, much smarter and is able to anticipate his every move.
—dmcreif