A prehistoric monster is sighted in the waters of the Hudson River! It is a hallucination, or something that had to be kept secret is out of control? This (and more) is what is asked Martin Mystère, to receive a request for help from his old friend Beverly Howard-Carter?
This is a crossover story with Nathan Never saga of speaking reptiles, the Venerables which are apparing in NN 91, 97-98 and 115-116.