AJ MacKenzie is the pseudonym of Marilyn Livingstone and Morgen Witzel, an Anglo-Canadian husband-and-wife writing duo. Between them they have published more than twenty non-fiction books on subjects such as management, economic history and medieval warfare. The Body on the Doorstep is their first novel, published by Zaffre in April 2016. This is the first book in a series, The Romney Marsh Mysteries, featuring the Reverend Hardcastle, rector of St Mary-in-the-Marsh and the mysterious widow Mrs Amelia Chaytor.

Some come to Romney Marsh as smugglers. Some come as spies. Some come only to hide.

Some come to die.