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Over the spanning nearly four hundred years, the Atlantic slave trafficking system saw 12.5 million Africans trafficked from their continent to the Americas. A staggering 1.8 million of those souls died during the Middle Passage, enduring scarcely imaginable conditions of overcrowding, filth, and disease. Many took their own lives by leaping overboard, while still more were callously thrown into the sea.

A Tale of Two Stories

In The Zorg, author Siddharth Kara weaves together two parallel narratives. The first chronicles a horrific incident aboard the namesake slave ship—the systematic drowning of 132 captive individuals by its British crew. The second story examines how this atrocity played a pivotal role in the abolition of the Atlantic slave trade in 1807, driven in large part by the dedicated work of a dazzling array of committed campaigners. Among them was Olaudah Equiano, who authored one of the few surviving first-person accounts of the Middle Passage, describing it as “a scene of horror almost inconceivable”.

Liverpool's Central Role

The account begins in Liverpool, a port city that at the peak of its prosperity was responsible for 40% of Europe's slave trade. Financing slavery was a lucrative venture for not just the wealthy to the working classes. One such entrepreneur, William Gregson, saved up his earnings from his trade, invested them into the slave trade, and eventually became a wealthy burgher 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 filled with trade goods 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.

A Ship Seized

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 declaring war on the Dutch in late 1780, the Royal Navy granted British ships permission to capture Dutch property at sea—a virtual sanctioning of piracy. The Zorg was soon captured by a British captain and anchored 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 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, put a dozen of his own crew on board, and made Luke Collingwood, a ship's surgeon of dubious nautical skill, its captain. In August 1781, the Zorg left Accra carrying 442 captives, 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 transported on a slave ship.

The Zorg's journey was fraught with calamity. Dysentery ravaged the vessel, and then 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 masterfully utilizes period testimonies to paint a picture of the sheer horror. The graphic testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, describes how the captives' skin was often worn down to the bone from being packed on bare wood, their flesh pinched and torn between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was still far from Jamaica and critically short on water. The crew made the decision to throw overboard a number of the captives, who had already endured months of appalling conditions below deck. This unspeakable act was not motivated by ensuring survival—the Africans had begged to be spared, even without water rations—but by cold economic greed. Ship insurance policies did not cover deaths from natural causes, but they would pay for cargo discarded out of “necessity” for the ship's safety. Over a period of days, the crew murdered “those Africans who would be worth less at auction”—the infirm, the sick, along with women and children, even a baby born during the voyage.

Insurance and Injustice

Back in Liverpool, investor William Gregson was unhappy about the profit on his investment. He filed an insurance claim for £30 per lost slave—a substantial sum in today's money. The insurers refused to pay. In March 1783, Gregson took them to court and won a trial by jury, with his lawyers claiming 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.” Merely twelve days after the trial, an anonymous letter 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 read the letter and took it to the activist Granville Sharp, who petitioned for a new trial. At the following hearing, the events on the Zorg were examined in meticulous detail, exactly 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 first met. Over the subsequent years, they petitioned, made speeches, lobbied tirelessly, 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 debate over who or what deserves credit for abolition is a matter of debate. The Zorg's legacy, however, is visibly captured by J.M.W. Turner's famous painting, The Slave Ship, which was inspired by the events of 1781. While slavery has been widespread 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 unwavering persistence.

Kara's Narrative Method

In contrast to his other work—such as the acclaimed Cobalt Red—Kara has had to address certain gaps in the available documentation. Consequently, speculative passages contrast with scrupulously factual accounts, giving the book a somewhat chimeric feel. A blend of narrative suspense and part historical analysis, The Zorg ultimately manages to shedding light on one of history's darkest chapters, using powerful storytelling and documented fact to assemble a portrait that haunts the reader long after the final page.