A. J. Warren
William Warren Humble (A. J. Warren) was born in Houghton-Le-Spring, Co Durham, England, and moved to Berlin in 1997. Whilst working there, he studied German and later in life was persuaded by a friend to take up writing. The 22 years spent living there allowed him to explore the corners and the culture of the city in detail. The culmination of these events led to his first detective book.