Loosely inspired by Conan Doyle and Holmesian literature, this story follows the framing template of a narrating veteran, Cpt. John Wyndham, writing at some point in the future, searching for a place to live. His search leads to his meeting an alarmingly eccentric and brilliant individual (Ms. S. Haas), with whom he will share many strange adventures. However, the stories vary somewhat after this initial exposition. For example, the setting, an unexplained Victorian-esque fluid-reality interdimensional crossroads city (and environs), allows the introduction of a great number of elements from fantasy, steampunk, modern science fiction, and Lovecraftian horror to the otherwise familiarly twisted plot. 

The eponymous letter is revealed to have been used to blackmail one of Ms. Haas’ former lovers, who then enlists the pair to save her upcoming wedding. Thus begin various excursions throughout and beyond the city, along the way exposing Mr. Wyndham to excessive danger and Ms. Haas to minor inconveniences, in order to find and stop the blackmailer. Even the narrative’s rote information gathering stage is enlivened by various chases, tasteful flashbacks, the contrast of the strongly bohemian Ms. Haas and the hapless Victorian-great-aunt-minded Wyndham, and periodic near-death experiences.

This book was a highly enjoyable light read, which shared an excellent mystery and dramatically balanced final confrontation with vivid world-building, while never failing to disrupt the sense of otherworldliness, horror, and wonder created by the mindsets of characters accustomed to disruptions of reality. Appropriate for readers as young as 10, but better appreciated by ages 14 to 16.

Review by Sasha