18th Century Europe: It is an age when superstition is beginning to give way to the force of human reason, and no man so fully embodies the spirit of the times as Dr. Erasmus Darwin. Thinker, healer, and explorer of the bizarre and the seemingly supernatural, no mystery can stand for long against Darwin's enlightened analysis. And there are far more mysteries than history knows. . . .

For Erasmus Darwin's world is filled with oddities that most cannot believe: from unknown beings lurking just outside the boundaries of civilization, to anomalies that even the greatest natural philosophers will be hard-pressed to explain, to mysterious deaths that give rise to fears of malevolent sorcery.

And when the renowned Dr. Darwin is called upon to heal a man dying of an ailment that seems impossible, he has no idea that it is the beginning of a quest that will lead him to the darkest corners of Europe, and a stunning encounter with the most famous inhabitant of a certain Scottish loch. . . .