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Over the course of nearly four hundred years, the transatlantic slave trade resulted in 12.5 million Africans trafficked from their continent to the Americas. A devastating 1.8 million of those souls died during the Middle Passage, enduring scarcely imaginable conditions of overcrowding, filth, and illness. Some took their own lives by leaping overboard, while still more were forcibly cast into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara weaves together two interconnected narratives. The first details a horrific incident aboard the eponymous slave ship—the deliberate murder of 132 captive individuals by its British crew. The second story explores how this event came to influence the ending of the Atlantic slave trade in 1807, thanks largely by the dedicated work of a dazzling array of abolitionist activists. Among them was Olaudah Equiano, who authored one of the rare first-person narratives of the Middle Passage, describing it as “a scene of horror almost inconceivable”.

The Roots in Liverpool

The account begins in Liverpool, a port city that at the peak of its prosperity was accountable for 40% of Europe's slave trafficking. Investing in slavery was a lucrative venture for everyone from the wealthy but also the working classes. One such entrepreneur, William Gregson, saved up his earnings from rope-making, ploughed them into the slave trade, and rose to become a wealthy burgher and even mayor. Gregson provided the funds for the slave ship The William, which departed from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its hold was loaded with trade goods like tobacco, firearms, knives, and various “India goods” such as chintz and cowrie shells—the latter being a common currency in the acquisition of human beings.

A Ship Seized

Around the same time, a Dutch slave vessel named the Zorg (later anglicized by the British as the Zong) had left the Netherlands. With Britain declaring war on the Dutch in late 1780, the Royal Navy granted British ships authority to seize Dutch property at sea—a virtual license for piracy. The Zorg was soon captured by a British captain and anchored off the Gold Coast. Meanwhile, Captain Hanley, during one of his voyages, picked up a disgraced British governor named Robert Stubbs, who had been expelled for corruption.

The Nightmare Passage

When Hanley reached Cape Coast Castle—a fortress with a vast holding cell beneath it—he assumed control of the captured Zorg. He proceeded to severely overcrowd it with captives, put a dozen of his own crew on board, and appointed Luke Collingwood, a ship's surgeon of dubious seamanship, its captain. In August 1781, the Zorg left Accra carrying 442 enslaved Africans, 17 crew members, and one notorious passenger: the former governor, Robert Stubbs.

Kara excels in using contemporaneous sources to vividly reconstruct the general hell of being trafficked on a slave ship.

The Zorg's journey was fraught with disaster. Dysentery swept through the vessel, followed by scurvy. The captain fell ill, became delirious, and handed command over to Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara effectively employs eyewitness accounts to paint a picture of the unmitigated terror. The graphic testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, describes how the enslaved people's skin was often worn down to the bone from lying on bare wood, their flesh caught between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was far from Jamaica and dangerously short on water. The crew resolved to throw overboard a number of the enslaved Africans, who had already suffered through months of obscene conditions below deck. This monstrous act was not motivated by ensuring survival—the Africans had pleaded to be spared, even without water rations—but by pure economic greed. Maritime insurance policies did not cover losses from natural causes, but they did cover cargo jettisoned out of “necessity” for the ship's safety. Over a period of days, the crew drowned “those Africans who would be worth less at auction”—the weak, the sick, along with women and children, among them a baby born during the voyage.

Insurance and Injustice

Back in Liverpool, investor William Gregson was unhappy about the profit on his investment. He submitted an insurance claim for £30 per drowned captive—a considerable sum in today's money. The insurers refused to pay. In March 1783, Gregson sued and was awarded a trial by jury, with his lawyers arguing that throwing the enslaved people overboard had been “necessary.”

Catalyzing the Movement

According to Kara, “there is a direct line of causality between the public exposure of the Zorg murders and the first movement to abolish slavery in England.” Merely twelve days after the trial, an anonymous letter appeared in a prominent English newspaper. The author, who claimed to have attended the court proceedings, made a powerful case against slavery, using the Zorg case as a key illustration of its inherent evil. Olaudah Equiano read the letter and took it to the abolitionist Granville Sharp, who filed a motion for a new trial. At the following hearing, the events on the Zorg were examined in forensic detail, precisely what the abolitionists had hoped for.

A Sustained Campaign

In the spring of 1787, the initial group of the Society for Effecting the Abolition of the Slave Trade convened. Over the following years, they wrote letters, made speeches, organized campaigns, and meticulously documented the realities of the slave trade. “Their efforts,” Kara writes, “would lay a blueprint for the pursuit of social justice.” After years of setbacks, the Act for the Abolition of the Slave Trade was finally passed in 1807.

An Enduring Impact

The question of who or what should be credited for abolition remains a matter of debate. The Zorg's influence, however, is powerfully captured by J.M.W. Turner's famous painting, The Slave Ship, which was based on the events of 1781. While slavery has been near-universal in human history, its abolition following a prolonged public movement was historic, serving as an affirmation to the power of persistent activism, the pen, and unwavering persistence.

Kara's Narrative Method

Unlike his previous books—such as the Pulitzer finalist Cobalt Red—Kara has had to fill in certain lacunae in the historical record. Consequently, imaginative flourishes sit awkwardly next to rigorously researched accounts, giving the book a slightly chimeric feel. Part thriller and part serious nonfiction, The Zorg nevertheless succeeds in illuminating one of history's darkest chapters, using compelling prose and meticulous research to create a account that stays with the reader long after the final page.