Robert Maldron: Night of the Werewolves

A virus invades the plane of existence of higher evolved creatures known as the Continuum, which affects the quality of the bodily fluids that they produce and consume from each other to survive. The virus also makes them sterile, unable to reproduce offspring to maintain quality reserves of fluid.  These creatures aim to reach a state of spiritual perfection without physical form eventually like so many of the other Continuum members, but for now they must find a way to survive.
The Council of the Continuum devise an experiment where the spirits of the  last remaining unborn infants are placed inside physical bodies and born on a parallel plane of existence, isolated from the virus. The experiment requires that the new born evolve and return over a finite life span, during which valuable body fluids will be harvested by the Continuum and its members during rest periods for their nourishment and continued existence. The experiment participants only become aware of their true origins when their physical life ends and they return to the Continuum plane. The plane on which they are to live out these lives is designated Project Earth, the unborn offspring given the generic name, human and the body fluid that is so important to the Continuum members is given the  name blood.
Project Earth delivers on its promises until late in the 19th century when the human race evolves more quickly than the Continuum predicted with technological advances. Human race takes a direction contrary to the objectives of Project Earth with exploitation of the natural environment, such as the taking of natural resources and abuse of their physical bodies through the excessive drinking of alcohol, taking of narcotics and introduction of blood disorders and diseases. The quality of blood suffers and Continuum members begin to harvest an inferior product and once more begin to slowly lose their immortality.
Exploitation of the earth and its environment causes weaknesses to appear randomly around the planet between the Continuum plane and that of the earth and Continuum creatures, disenchanted with Project Earth, access the earth plane to take what they need to survive by force. Earth's history over the millennia is littered with the legends of strange sightings of and battles with non-humans from the creatures of Greek myth to the werewolf and vampire of literary acclaim. One such creature, a vampire by human description, is Max Von Konstein, Continuum Project Earth director designate. It's Von Konstein's role on earth to find an antidote for the virus , steer human kind where possible without interfering directly and stop unauthorised access to earth by Continuum inhabitants.
To help him he calls upon the services of ex-union army doctor, Robert Maldron. Maldron was an officer in the American union army, fatally wound at Gettysburg until befriended by Von Konstein and his passing troop. With the option of death and that of having blood from a Continuum member in his veins, he chooses the latter and with it he acquires an extended life span and enhanced abilities. In repayment for sparing his life, Maldron is occasionally called upon by Von Konstein for help.
It's 1945 and the dropping of the atom bomb over Hiroshima creates a weakness between the two planes off the east coast of North America and two Lycanthe slip through, werewolves in human mythology, in search of female mates to increase their species or alternatively, to take blood by force.   
Maldron must stop them, by persuasion if possible, but he must stop them.