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Over the course of nearly four hundred years, the Atlantic slave trafficking system saw 12.5 million Africans trafficked from their homelands to the Americas. A devastating 1.8 million of those souls perished during the voyage, enduring scarcely imaginable conditions of extreme confinement, filth, and illness. Many took their own lives by throwing themselves overboard, whereas still more were forcibly cast into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara weaves together two parallel narratives. The first chronicles a harrowing incident aboard the namesake slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story examines how this event came to influence the ending of the Atlantic slave trade in 1807, driven in large part by the dedicated work of a coalition 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 originates in Liverpool, a port city that at the height of its prosperity was responsible for 40% of Europe's slave trade. Investing in slavery was a lucrative venture for not just the wealthy but also the common people. One such entrepreneur, William Gregson, accumulated his earnings from his trade, ploughed them into the slave trade, and eventually became a wealthy burgher and later mayor. Gregson provided the funds for the slave ship The William, which set sail from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its cargo was loaded with commodities like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the shells being a standard rate in the acquisition of enslaved people.

The Capture of the Zorg

Concurrently, a Dutch slave vessel named the Zorg (later referred to 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 permission to capture Dutch property at sea—a virtual license for privateering. The Zorg was subsequently captured by a British captain and anchored off the Gold Coast. Meanwhile, Captain Hanley, during one of his voyages, picked up a fleeing British governor named Robert Stubbs, who had been removed for graft.

A Voyage into Hell

When Hanley reached Cape Coast Castle—a stronghold with a vast holding cell beneath it—he took command of the captured Zorg. He proceeded to severely overcrowd it with captives, placed 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 captives, 17 crew members, and one depraved passenger: the former governor, Robert Stubbs.

Kara is particularly skilled at using contemporaneous sources to bring to life the collective nightmare of being transported on a slave ship.

The Zorg's journey was plagued with calamity. "The flux" swept through the vessel, followed by scurvy. The captain fell ill, became delirious, and appointed Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara masterfully utilizes eyewitness accounts to illustrate of the sheer horror. The powerful testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, describes how the enslaved people's skin was frequently worn down to the bone from lying on bare wood, their flesh pinched and torn between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was still miles from Jamaica and critically short on water. The crew made the decision to jettison a number of the captives, 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 allowed to live, even without water rations—but by cold economic greed. Maritime insurance policies did not cover losses from disease, but they did cover 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 infirm, the sick, including women and children, among them a baby born during the voyage.

The Courtroom Battle

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

The Spark for Abolition

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 prominent English newspaper. The author, who claimed to have been present the court proceedings, made a powerful case against slavery, citing the Zorg case as a prime example of its brutality. Olaudah Equiano saw the letter and brought it to the activist Granville Sharp, who petitioned for a new trial. At the subsequent hearing, the events on the Zorg were reviewed in forensic detail, precisely what the abolitionists had hoped for.

The Road to 1807

In the spring of 1787, the founding members of the Society for Effecting the Abolition of the Slave Trade first met. 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 deserves credit for abolition is contentious. The Zorg's legacy, however, is visibly evident in 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 sustained mass campaign was historic, serving as an affirmation to the power of moral courage, the pen, and unwavering determination.

The Author's Approach

Unlike his previous books—such as the acclaimed Cobalt Red—Kara has had to address certain lacunae in the available documentation. At times, imaginative flourishes sit awkwardly next to scrupulously factual 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 powerful storytelling and documented fact to create a portrait that haunts the reader well after the final page.