As inflated as waterwings, this improbably complicated business about Project Neptune, a dead body which is washed up in Hawaii, porpoises trained to signal human intervention on an aquagraph, and one retired Mr. Grove. He's a former OSS man, acrobat, magician, manufacturer of games now playing a combination of Chinese Checkers and Russian Roulette as he undertakes a mission for the Chief Executive. Along with a corpulent Russian opponent of an earlier era and the C.I.A., there's a pretty (almost too) young girl who may be with him in his next adventure. Mr. Grove is quite genial but you will find it hard to keep up with him -- perhaps even porpoiseless.