A Certain Dr Thorndyke by R. Austin Freeman

For a man in search of quiet and retirement, the village of Adaffia would seem to be an ideally eligible spot; especially if the man in question should happen be under a rather heavy cloud. Situated in a little known part of the Slave Coast, many miles distant from any town or settlement where white men had their abodes, it offered a haven of security to the Ishmaelite if it offered little else.

Thus reflected John Osmond, late John Walker, and now 'Mr. James Cook', if the need for a surname should arise. But hitherto it had not arisen; for, to the natives, he was simply 'the white man' or 'mastah', and no other European had passed along the coast since the day on which he had buried Larkom -- and his own identity -- and entered into his inheritance.