"Practical, unassuming Jane Shoringfield has decided her most secure path forward is a husband, in a marriage of convenience, who will allow her to remain independent and occupied with meaningful work. Her first choice, the dashing but reclusive doctor Augustine Lawrence, agrees to her proposal with only one condition: that she must never visit Lindridge Hall, his crumbling family manor. Yet on their wedding night, an accident strands her at his door in a pitch-black rainstorm, and she finds him changed. Gone is the bold, courageous surgeon, and in his place is a terrified, paranoid man—one who cannot tell reality from nightmare. By morning Augustine is himself again, but Jane knows something is deeply wrong at Lindridge Hall and with the man she has so hastily bound her safety to. Soon Jane is fighting for her sanity and her life, drawn into a world of secret societies, theoretical mathematics, impossible magic, and rituals gone wrong. And now that the secrets of Lindridge Hall have met her, they're not about to let her go. Set in a dark-mirror version of postwar England, Caitlin Starling crafts a new kind of gothic horror from the bones of the beloved canon." - From the back of cover