This is an atmospheric mystery-thriller about the complexities of female friendships. The Deep Mad Dark opens as Detroit neurosurgeon Polly Lewis embarks on an unorthodox study in the field of memory and trauma. Her once closest friend - the irreverent, brilliant Tash Hollander - comes home after living many years in a strange, off-the-grid community in Belize. Upon her return, Tash insinuates herself into Polly's life in audacious ways that threaten everything Polly has achieved. But why? The Deep Mad Dark is a propulsive, layered mystery about an intoxicating friendship and how it leads to a brutal act of violence that drives two women in radically different ways. Set against the landscape of modern Detroit, it explores the power certain friendships have to shape who we are - in ways both beautiful and dangerous.