Sanctum by Denise Mina
This gripping novel delves into the dark and complex world of a young psychiatrist who becomes entangled in a web of mystery and danger when one of his patients, an artist with a troubled past, is suspected of murder. As he navigates the murky waters of mental illness, crime, and personal demons, the psychiatrist is forced to confront his own ethical boundaries and the shadowy figures that inhabit the sanctum of the human mind. Set against a backdrop of suspense and psychological intrigue, the story explores the thin lines between sanity and madness, guilt and innocence, drawing readers into a compelling narrative that challenges perceptions and keeps them guessing until the very end.