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Over the course of nearly four centuries, the Atlantic slave trafficking system resulted in 12.5 million Africans forcibly taken from their continent to the Americas. A devastating 1.8 million of those individuals died during the Middle Passage, enduring scarcely imaginable conditions of overcrowding, squalor, and illness. Some took their own lives by leaping overboard, whereas still more were callously thrown into the sea.

A Tale of Two Stories

In The Zorg, author Siddharth Kara weaves together two interconnected narratives. The first chronicles a horrific incident aboard the eponymous slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story examines how this event came to influence the abolition of the Atlantic slave trade in 1807, driven in large part by the relentless efforts of a coalition of committed campaigners. Among them was Olaudah Equiano, who wrote one of the rare first-person accounts of the Middle Passage, calling it “a scene of horror almost inconceivable”.

The Roots in Liverpool

The account originates in Liverpool, a port city that at the height of its economic power was responsible for 40% of Europe's slave trafficking. Investing in slavery was a highly profitable venture for everyone from the wealthy but also the common people. One such investor, William Gregson, accumulated his wages from rope-making, ploughed them into the slave trade, and rose to become a prominent citizen 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 filled with commodities like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the shells being a common currency in the acquisition of human beings.

The Capture of the Zorg

Around the same time, a Dutch slave vessel named the Zorg (later anglicized by the British as the Zong) had departed the Netherlands. With Britain at war with the Dutch in late 1780, the Royal Navy granted British ships permission to capture Dutch property at sea—a virtual license for privateering. The Zorg was subsequently taken by a British captain and held off the Gold Coast. Meanwhile, Captain Hanley, on a slaving expedition, took aboard a fleeing British governor named Robert Stubbs, who had been expelled for graft.

The Nightmare Passage

When Hanley arrived at Cape Coast Castle—a stronghold with a vast slave dungeon beneath it—he took command of the captured Zorg. He then grossly overload it with captives, placed a dozen of his own crew on board, and appointed Luke Collingwood, a ship's surgeon of questionable seamanship, its captain. In August 1781, the Zorg finally left Accra carrying 442 captives, 17 crew members, and one depraved passenger: the former governor, Robert Stubbs.

Kara is particularly skilled at using historical documents to bring to life the collective nightmare of being trafficked on a slave ship.

The Zorg's journey was fraught with disaster. Dysentery ravaged the vessel, followed by scurvy. The captain fell ill, lost his senses, and appointed Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara effectively employs eyewitness accounts to illustrate of the unmitigated terror. The graphic testimony of Alexander Falconbridge, a doctor who became an activist, details how the enslaved people's skin was often worn down to the bone from being packed on bare wood, their flesh pinched and torn between the planks.

The Unspeakable Decision

By late November 1781, the Zorg was miles from Jamaica and critically short on water. The crew resolved to jettison a number of the enslaved Africans, who had already suffered through months of appalling 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 cold economic greed. Maritime insurance policies did not cover deaths from natural causes, but they would pay for cargo jettisoned out of “necessity” for the ship's safety. Over several days, the crew murdered “those Africans who would be worth less at auction”—the weak, the sick, including women and children, even a baby born during the voyage.

Insurance and Injustice

Back in Liverpool, investor William Gregson was dissatisfied with the financial return on his investment. He submitted an insurance claim for £30 per drowned captive—a substantial 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.” Just twelve days after the trial, an published essay appeared in a widely read English newspaper. The author, who claimed to have been present the court proceedings, argued compellingly against slavery, using the Zorg case as a key illustration of its inherent evil. Olaudah Equiano saw 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 reviewed in meticulous detail, exactly what the abolitionists had wanted.

The Road to 1807

In the spring of 1787, the founding members of the Society for Effecting the Abolition of the Slave Trade convened. Over the following years, they petitioned, orated, organized campaigns, and meticulously documented the particulars of the slave trade. “Their efforts,” Kara writes, “would lay a blueprint for the pursuit of social justice.” After years of struggles, the Act for the Abolition of the Slave Trade was enacted in 1807.

A Lasting Legacy

The question of who or what deserves credit for abolition is contentious. The Zorg's legacy, 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 widespread in human history, its abolition following a prolonged public movement was unprecedented, serving as an testament to the power of moral courage, the pen, and relentless persistence.

Kara's Narrative Method

In contrast to his other work—such as the acclaimed Cobalt Red—Kara has had to fill in certain gaps in the available documentation. Consequently, imaginative flourishes contrast with rigorously researched accounts, giving the book a slightly hybrid feel. A blend of narrative suspense and part historical analysis, The Zorg nevertheless succeeds in shedding light on one of history's darkest chapters, using compelling prose and meticulous research to assemble a portrait that stays with the reader well after the final page.