Crime novelist Roger Blackwood competes with hotel house detective Andy McCabe in solving a murder by poisoning at a medical convention. Crime novelist Roger Blackwood competes with hotel house detective Andy McCabe in solving a murder by poisoning at a medical convention. Crime novelist Roger Blackwood competes with hotel house detective Andy McCabe in solving a murder by poisoning at a medical convention. Crime novelist Roger Blackwood competes with hotel house detective Andy McCabe in solving a murder by poisoning at a medical convention.