In 2040, the South African National Space Agency receives a mysterious package containing a memoir and a set of digital recordings from an unnamed woman who claims the world will end in ten years. Assigned to the case, Dr. Naomi Buthelezi, a retired professor and science-fiction writer, is hired to investigate the veracity of the materials, and whether or not the woman's claim to have heard from a "force more powerful than humankind" is genuine.

Thus begins Triangulum, a found manuscript composed of the mysterious woman's memoir and her recordings. Haunted by visions of a mysterious machine, the narrator is a seemingly adrift 17-year-old girl, whose father never recovered from the shock of losing his wife. She struggles to navigate school, sexual experimentation, and friendship across racial barriers in post-Apartheid South Africa.

With extraordinary aplomb and breathtaking prose, Ntshanga has crafted an inventive and marvelous novel.