With her cluttered main deck and her broad beam, the Ibis was sometimes taken for a schooner-rigged barque by old sailors: whether there was any truth to this Zachary did not know, but he never thought of her as anything other than the topsail schooner that she was when he first signed on to her crew. To his eye there was something unusually graceful about the Ibis's yacht-like rigging, with her sails aligned along her length rather than across the line of her hull. He could see why, with her main- and headsails standing fair, she might put someone in mind of a white-winged bird in flight: other tall-masted ships, with their stacked loads of square canvas, seemed almost ungainly in comparison.

One thing Zachary did know about the Ibis was that she had been built to serve as a 'blackbirder', for transporting slaves. This, indeed, was the reason why she had changed hands: in the years since the formal abolition of the slave trade, British and American naval vessels had taken to patrolling the West African coast in growing numbers, and the Ibis was not swift enough to be confident of outrunning them. As with many another slave-ship, the schooner's new owner had acquired her with an eye to fitting her for a different trade: the export of opium. In this instance the purchasers were a firm called Burnham Bros., a shipping company and trading house that had extensive interests in India and China.

The new owners' representatives had lost no time in calling for the schooner to be dispatched to Calcutta, which was where the head of the house, Benjamin Brightwell Burnham, had his principal residence: the Ibis was to be refitted upon reaching her destination, and it was for this purpose that Zachary had been taken on. Zachary had spent eight years working in the Gardiner shipyard, at Fell's Point in Baltimore, and he was eminently well-qualified to supervise the outfitting of the old slave-ship: but as for sailing, he had no more knowledge of ships than any other shore-bound carpenter, this being his first time at sea.