Other detectives get the Maltese Falcon. I get a paranoid rabbit."" So says Eddie Valiant, narrator-shamus of this very silly, very overextended, and sometimes very funny mystery/fantasy weirdness by sf writer Wolf (The Resurrectionist). In the world here, you see, there are humans and there are ""'toons"": human-size creatures who are cartoon characters. . . and who have the ability to create their own temporary doppelgangers. Anyway, Roger Rabbit hires Valiant to learn why Roger hasn't gotten his own starring cartoon role from the DeGreasy brothers. Soon, however, Roger is murdered; and so is one of the DeGreasys. Whodunit? Will you care? Hardly. But there are more than a few laughs as Valiant--with the late Roger's doppelganger as his Watson--sleuths into 'toon porn, 'toons' rights, 'toon mythology, and 'toon psychiatry. (Roger Rabbit's shrink is a 'toon beaver, graduate of TCU--'Toon Christian University, of course.) Occasionally hilarious, genuinely disorienting (for a chapter or so) in its premise: a spotty parody-novel that would have made a superb short story.