From straight mystery (Cry Havoc) and devious adventure (High Hazard) this combines elements of both with romance and self-discovery in a fairly sleek if no more than subcutaneous fashion. Bill Carson tells the story, his own, and that of Marvin Ross, an electronics whiz kid, his friend, his enemy, his partner, and his ""right hand opposite"" or mirror image. Ross now is in a oxygen tent after a coronary and this retraces the pressures that put him there: they skyrocket success of his business but the fear of failure; the wife who loved him but demanded too much of him; etc. etc. And during the vigil kept here Carson reviews Ross' past and is forced to revise his own future.... It moves--- but only along lines which are strictly popular in derivation and designation.