Homicide detectives Kate Martinelli and Al Hawkin are investigating the death of a man whose cremated remains are found in San Francisco's Golden Gate Park. Implicated in the death is Erasmus, a wandering soul and a scholarly street person, who quotes from the Bible and Shakespeare to answer all questions, leaving the two worldly detectives to puzzle over his meaning. Either he killed the man, or he knows who did. They must find a way to make him talk in a way that will make sense to the legal system and solve the crime.