The 11th adventure in which Mongo Frederickson (Dark Chant in a Crimson Key, etc.) uses superior intellect, circus tricks, karate, magic, and pretentious metaphysical folderol to foil various scourges of Western Civilization--here, the loathsome Sacra Silver, who's intent on breaking up the marriage of Mongo's brother and sister-in-law, illegally polluting the Hudson by dumping chemicals from his daddy's fleet of tankers, and making a few zillion on the side by selling parched Kuwaitis shiploads of the (contaminated) Hudson. When both the Coast Guard and the police skirt responsibility for the filth--as well as the propeller- chopped body recently found in the river--Mongo sallies forth to waylay a tanker headed for the Tappan Zee. Despite a concussion, he succeeds--only to find his brother wired up to a homemade electric chair and his sister-in-law forced to commit mayhem to save him. Mongo, a comic-book hero sans pictures, again blathers on about witches, the supernatural, and his personal philosophy (``Love, my friend, is the greatest mystery of all'')--all done in a manner destined to please the converted.