Zagor and Chico arrive at the annual trappers' meeting. But the joy and merriment are soon spoiled by the arrival of the wounded Boston Jack. The Munsee Indians attack the trappers for no apparent reason...
Together with Chico and Trampi, Zagor helps Pickens free his wife, and eventually clashes with the kidnappers, where he meets the titular Mr. Smith, a strange man who is in fact the real reason for all this complication.
In this episode, Zagor once again has to deal with vampires, namely the captain of the monster ship "Black Ivory" Van Zant and the well-known Ylenia Varga, a red-haired bloodsucker, dangerous and equally beautiful...