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Over the course of nearly four hundred years, the Atlantic slave trafficking system resulted in 12.5 million Africans forcibly taken from their homelands to the Americas. A staggering 1.8 million of those souls died during the voyage, subjected to unfathomable conditions of overcrowding, squalor, and disease. Many took their own lives by throwing themselves 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 enslaved Africans by its British crew. The second story examines how this atrocity came to influence the abolition of the Atlantic slave trade in 1807, thanks largely by the dedicated work of a coalition of abolitionist activists. Among them was Olaudah Equiano, who wrote one of the few surviving first-person accounts of the Middle Passage, calling it “a scene of horror almost inconceivable”.

The Roots in Liverpool

The tale originates in Liverpool, a port city that at the height of its economic power was responsible for 40% of Europe's slave trade. Financing slavery was a highly profitable venture for everyone from the elites to the common people. One such investor, William Gregson, saved up his earnings from rope-making, ploughed them into the slave trade, and eventually became a prominent citizen and even mayor. Gregson financed the slave ship The William, which set sail from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its hold was loaded with commodities like tobacco, firearms, knives, and various “India goods” such as chintz and cowrie shells—the shells being a standard rate in the acquisition of human beings.

The Capture of the Zorg

Around the same time, a Dutch slave vessel named the Zorg (later referred to by the British as the Zong) had left the Netherlands. With Britain at war with the Dutch in late 1780, the Royal Navy granted British ships authority to seize Dutch ships at sea—a virtual sanctioning of privateering. The Zorg was subsequently captured by a British captain and held 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.

A Voyage into Hell

When Hanley reached Cape Coast Castle—a fortress with a notorious holding cell beneath it—he assumed control of the captured Zorg. He proceeded to severely overcrowd it with enslaved people, placed a dozen of his own crew on board, and made 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 notorious passenger: the former governor, Robert Stubbs.

Kara is particularly skilled at using contemporaneous sources to vividly reconstruct the general hell of being trafficked on a slave ship.

The Zorg's journey was plagued with disaster. Dysentery swept through the vessel, followed by scurvy. The captain succumbed to sickness, lost his senses, and appointed Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara masterfully utilizes period testimonies to paint a picture of the sheer horror. The graphic testimony of Alexander Falconbridge, a doctor who became an activist, describes how the captives' skin was often worn down to the bone from lying on bare wood, their flesh pinched and torn between the planks.

The Unspeakable Decision

By late November 1781, the Zorg was still miles from Jamaica and critically short on water. The crew resolved to throw overboard a number of the enslaved Africans, who had already endured months of obscene conditions below deck. This unspeakable act was not motivated by preserving life—the Africans had pleaded to be allowed to live, even without water rations—but by pure economic greed. Ship insurance policies did not cover losses from natural causes, but they would pay for 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, including women and children, even a baby born during the voyage.

The Courtroom Battle

Back in Liverpool, investor William Gregson was unhappy about the profit on his investment. He filed an insurance claim for £30 per drowned captive—a substantial sum in today's money. The insurers declined to pay. In March 1783, Gregson sued and was awarded a trial by jury, with his lawyers claiming 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 anonymous letter appeared in a prominent English newspaper. The author, who claimed to have been present the court proceedings, argued compellingly against slavery, citing the Zorg case as a key illustration of its inherent evil. Olaudah Equiano read the letter and took it to the activist Granville Sharp, who filed a motion for a new trial. At the subsequent hearing, the events on the Zorg were reviewed in meticulous 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 convened. Over the following years, they wrote letters, orated, organized campaigns, and gathered evidence on 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 debate over who or what deserves credit for abolition is contentious. The Zorg's legacy, however, is visibly 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 mass campaign was historic, serving as an affirmation to the power of moral courage, the pen, and relentless persistence.

The Author's Approach

Unlike his previous books—such as the acclaimed Cobalt Red—Kara has had to address certain gaps in the available documentation. Consequently, imaginative flourishes contrast with rigorously researched accounts, giving the book a slightly chimeric feel. A blend of narrative suspense and part serious nonfiction, The Zorg ultimately succeeds in illuminating one of history's darkest chapters, using powerful storytelling and meticulous research to assemble a portrait that haunts the reader well after the final page.