John Croaker's life was an extraordinarily fascinating one. Born in humble but respectable circumstances in Canterbury, Kent, he was principal clerk at the Isle of Thanet Bank in Margate. In 1815 he apparently became unhinged and began cheating in the bank's ledgers. After absconding to Calais with some stolen assets, he was convicted of embezzling the proceeds of a bill of exchange.
Croaker was transported to Australia for fourteen years and...