Learner's The Witch of Cologne is an erotically-charged novel of people swept inexorably along by events they could not control. In Soul, Learner relates the story of Lavinia and Julia Huntington, passionate women trapped in emotional whirlpools that threaten to drown them and everyone they love.

In 19th century Britain, Lavinia is married to an older man who seems to appreciate her lively curiosity. Lavinia proves to be an apt pupil in both the study and the bedroom, glorying in the pleasures of the physical.

In 21st century Los Angeles, geneticist Julia is trying to identify people who can kill without remorse. Stunned to discover that she seems to possess the trait she is looking for, Julia is reassured of her emotions by her intense passion for her husband and her delight in her pregnancy.

In the past, Lavinia's desire for her husband grows, but his cools as he becomes fascinated with another. In the present, Julia's love overwhelms her husband, who leaves her.

Lavinia and Julia feel the tortures of passion unspent. Cold logic tells them that the deaths of their tormentors will bring them peace. Separated by a hundred years, two Huntington women face the same decision. Their choices will echo far into the future.