From the bestselling author of The Girl in the Spider’s Web comes another mystery led by detective duo Rekke and Vargas: this time, their hunt for a killer has a literary twist.

Professor Hans Rekke and police officer Micaela Vargas have earned a reputation for solving the unsolvable. But they’ve never been confronted by a serial killer. Until now.

Rekke receives a visit from Spanish chief inspector Rafael Corales, who is unable to forget the brutal, unsolved murder of a young woman in Santander in 1988. Now other bodies have come to light, marked with signs that seem to be some kind of numerical order. Still recovering from his latest manic episode, his relationship with Vargas strained by a secret she’s keeping, Rekke agrees to help decipher these signs before the killer strikes again.

The victim was an aspiring writer, and clues from her posthumously published short story about a stray dog draw Rekke and Vargas deep into the murk of Sweden’s literary scene. To unmask the killer, Rekke must relearn the difference between fact and fiction, and discover what really happened that night back in the 1980s.

In yet another intricate and exciting puzzle mystery, David Lagercrantz draws on the literary world that he—and we—know all too well to tell a story about guilt, shame, repressed memories, human depravity, and publishing.