To throw the book at someone means to charge them with as many crimes as possible, so the police could still charge him with a lot of crimes even if they only found the upper torsos of the bodies.
Context: Brother number two claimed the police couldn't charge him with the maximum possible number of crimes because they only found the upper torsos of his butchered bodies.
Hypothesis: Brother number two claimed the police couldn't throw the book at him because they only found the upper torsos of his butchered bodies.

Is the hypothesis incorrect? (Yes, no, or unknown)?