This Day Is Darkr. h. Sins This Day Is Dark is a blistering case study of when red flags are mistaken for passion and love falls in the hands of the wrong people, as explored in his signature poetic voice. From New York Times bestselling author r. h. Sin comes This Day Is Dark, a heartbreakingly relatable collection of poetry and prose that captures some of the darkest moments over an 18 year period. This Day Is Dark is an evocative exploration into what it means and