Knock Knock (A Jack Nightingale Short Story)
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Jack Nightingale is called in to investigate an App that allows a demon from Hell to cause havoc on Earth. Knock Knock is a fast-paced supernatural story about 14,000 words long, featuring his long-suffering assistant Jenny McLean and his nemesis, the demon Proserpine.
Stephen Leather is one of the UK's most successful thriller writers, an ebook and Sunday Times bestseller and author of the critically acclaimed Dan "Spider' Shepherd series and the Jack Nightingale supernatural detective nove...























