Calling this "a rare novel of fear" is a bit misleading: there are some tense moments, but not enough to qualify the book as a mystery or even really a thriller. It's a bit of a hybrid work, falling more on the side of Stoker's romances (like The Snake's Pass and Lady Athelyne) but even then not quite as cloying or over-written. It might best be called a treatise on the "new woman" of the early 1900's that Stoker was intrigued by and populated his novels with even as he struggled to understand and accept them. Stephen Norman shares a good deal of personality with Mina Murray/Harker of Stoker's Dracula, which was published just eight years earlier. Stephen is, from childhood, precocious, forceful, secure in what she wants even if her methods are not always successful. She brooks foolishness from no man, although she occasionally acts foollishly herself. For most of the novel, she is a force of nature in control of her own destiny. Unfortunately, Stoker cannot resist in the final act having Stephen revert to the standard demure "woman waiting for a man to tell her he's interested in her" role that she bucks (with almost disastrous consequences) throughout the rest of the book. As with Mina in Dracula, who ultimately must be rescued by the men in her life, Stoker here can't quite seem to decide what to make of this strong capable woman he's created, and so he falls back on the old tropes. (As a side note, through most of the book Stephen reminds me very much of Katherine, the main character of Ellen Kushner's The Privilege of the Sword: a young girl raised to fulfill a man's role, strong and self-sufficient and head-strong.)
While Stephen is the center of the book and the most well-drawn character, the two main male characters are equally important to the story. Leonard Everard is pretty much the stereotype of a dissolute, entitled Victorian prat but he propels the plot. The book's title, though, comes from Harold An Wolf; a child in the book calls him "The Man," and the name sticks. Harold could have easily have been written as the stereotypical protector role to balance Leonard's villianous one, but Stoker allows his male hero a bit more nuance and fallability than the stereotype typically allows for. And make no mistake: Harold IS heroic, although he is not The Hero of the book (Stephen is clearly that). Throughout the novel, Harold is the one who takes physical chances, jumps in to save the day at the potential cost of his own life -- not once, but several times.
While The Man is not one of Stoker's supernatural novels (all of which are better than his romances, in my opinion), there are some genuinely creepy moments: a childhood visit to a crypt, several encounters between Stephen and Leonard, and Stephen's encounter with a mysterious old Quaker woman all feel like they could be in a supernatural novel. There are also several gripping action sequences, the final of which allows both Stephen and Harold to be equally heroic both physically and emotionally. That scene isn't the conclusion of the novel, which adds a few standard "roadblocks to happiness" to wrap things up, but it is the physical and emotional climax, very cinematically written.
As I write this review, I'm realizing that I liked the book more than I thought I did; my major disappointment comes from the odd turn Stephen takes in the novel's concluding segment, where she seems to lose a great deal of the strength she's displayed throughout the book.