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Over the course of nearly four centuries, the transatlantic slave trade saw 12.5 million Africans trafficked from their homelands to the Americas. A devastating 1.8 million of those souls died during the Middle Passage, subjected to unfathomable conditions of overcrowding, filth, and illness. Some took their own lives by leaping overboard, while others were forcibly cast into the sea.

A Tale of Two Stories

In The Zorg, author Siddharth Kara weaves together two parallel narratives. The first chronicles a harrowing incident aboard the eponymous slave ship—the deliberate murder of 132 captive individuals by its British crew. The second story explores how this atrocity came to influence the abolition 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 wrote 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 economic power was responsible for 40% of Europe's slave trafficking. Investing in slavery was a lucrative venture for everyone from the elites to the common people. One such investor, William Gregson, saved up his wages from rope-making, ploughed them into the slave trade, and eventually became a prominent citizen and later mayor. Gregson financed 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 trade goods like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the shells being a standard rate in the purchase of enslaved people.

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 left the Netherlands. With Britain declaring war on the Dutch in late 1780, the Royal Navy gave British ships authority to capture Dutch property at sea—a de facto sanctioning of piracy. The Zorg was subsequently taken by a British captain and held 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 arrived at Cape Coast Castle—a stronghold with a notorious holding cell beneath it—he took command of the captured Zorg. He proceeded to grossly overload it with enslaved people, put 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 left Accra carrying 442 captives, 17 crew members, and one notorious passenger: the former governor, Robert Stubbs.

Kara excels in using historical documents to vividly reconstruct the collective nightmare of being trafficked on a slave ship.

The Zorg's journey was fraught 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 effectively employs period testimonies to illustrate of the sheer horror. The graphic testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, describes how the captives' skin was frequently rubbed raw 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 far 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 appalling conditions below deck. This unspeakable act was not motivated by preserving life—the Africans had begged to be allowed to live, even without water rations—but by pure economic greed. Maritime insurance policies did not cover losses from disease, but they would pay for cargo jettisoned 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 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 venture. He submitted an insurance claim for £30 per lost slave—a considerable 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, using the Zorg case as a key illustration of its brutality. 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 forensic detail, exactly what the abolitionists had wanted.

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.

An Enduring Impact

The question of who or what should be credited for abolition remains a matter of debate. 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 widespread in human history, its abolition following a sustained mass campaign was unprecedented, serving as an affirmation to the power of persistent activism, 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 gaps in the historical record. Consequently, imaginative flourishes contrast with scrupulously factual accounts, giving the book a slightly chimeric feel. A blend of narrative suspense and part serious nonfiction, The Zorg nevertheless succeeds in shedding light on one of history's most horrific episodes, using compelling prose and documented fact to create a account that stays with the reader long after the final page.