The novel is a complex narrative that weaves together the story of two sisters in early 20th century Canada, one of whom publishes a scandalous novel that leads to her suicide. The surviving sister, now an elderly woman, reflects on their lives, revealing family secrets, heartbreak, and the truth behind the scandalous novel. The narrative is interspersed with excerpts from the controversial book, a science fiction story within a story, adding layers of intrigue and mystery.

This book intertwines the true tales of two men during the 1893 Chicago World's Fair: Daniel H. Burnham, the architect responsible for the fair's construction, and H.H. Holmes, a serial killer masquerading as a charming doctor. The narrative alternates between the story of Burnham, his challenges and successes in building the fair, and the chilling story of Holmes, who used the fair to lure his victims to their death. It's a vivid portrayal of the Gilded Age and a chilling exploration of one of America's first known serial killers.

"The Swarm" is a science fiction novel that explores the disastrous consequences of mankind's exploitation of the world's oceans. The narrative follows a group of scientists around the world as they try to understand a series of inexplicable, catastrophic natural disasters. They eventually discover that these events are not random but are the result of a collective intelligence in the sea, a swarm of marine life that has decided to fight back against humanity's destruction of their habitat. The book combines elements of ecological thriller, disaster novel, and speculative fiction as it explores the potential consequences of human interference with the natural world.