This is another great and funny short novel by Hiaasen. I enjoy his adult-oriented novels too, but his earlier YA novel Hoot is, IMO, some of his best work. This one isn't quite as tightly presented as Hoot, but it's highly enjoyable as well. A few situations in Flush were slightly improbable, but the characters and the settings are where Hiaasen shines anyway. (Obviously, the situations in his adult novels are improbable, but it seems less important than in his YA work.)
Anyway, recommended for the YA fan, or for Hiaasen fans in general.