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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 devastating 1.8 million of those individuals died during the voyage, enduring unfathomable conditions of overcrowding, squalor, and disease. Many chose to end their suffering by throwing themselves overboard, whereas others were forcibly cast into the sea.

A Tale of Two Stories

In The Zorg, author Siddharth Kara weaves together two interconnected narratives. The first details a harrowing incident aboard the namesake slave ship—the systematic drowning of 132 captive individuals by its British crew. The second story examines how this atrocity came to influence the ending 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 rare first-person narratives of the Middle Passage, calling it “a scene of horror almost inconceivable”.

The Roots in Liverpool

The tale begins in Liverpool, a port city that at the height of its prosperity was accountable for 40% of Europe's slave trade. Financing slavery was a lucrative venture for everyone from the elites but also the working classes. One such entrepreneur, William Gregson, accumulated his wages 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 trade goods like tobacco, firearms, knives, and various “India goods” such as chintz and cowrie shells—the latter being a common currency in the purchase of human beings.

A Ship Seized

Concurrently, 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 granted British ships permission to seize Dutch ships at sea—a de facto license for piracy. The Zorg was soon 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 reached Cape Coast Castle—a fortress with a notorious holding cell beneath it—he assumed control of the captured Zorg. He then severely overcrowd it with captives, placed 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 enslaved Africans, 17 crew members, and one notorious passenger: the former governor, Robert Stubbs.

Kara excels in using contemporaneous sources to vividly reconstruct the collective nightmare of being transported on a slave ship.

The Zorg's journey was plagued with disaster. Dysentery ravaged the vessel, and then scurvy. The captain succumbed to sickness, became delirious, and handed command over to Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara masterfully utilizes eyewitness accounts to illustrate of the unmitigated terror. The powerful testimony of Alexander Falconbridge, a doctor who became an activist, details how the captives' skin was frequently worn down to the bone from lying on bare wood, their flesh caught between the planks.

The Unspeakable Decision

By late November 1781, the Zorg was far from Jamaica and dangerously short on water. The crew resolved to jettison a number of the enslaved Africans, 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 pure economic greed. Maritime insurance policies did not cover deaths from disease, but they did cover 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, 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 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 took them to court 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 anonymous letter appeared in a widely read 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 filed a motion for a new trial. At the following hearing, the events on the Zorg were reviewed in meticulous detail, precisely what the abolitionists had wanted.

The Road to 1807

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 wrote letters, orated, 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 setbacks, the Act for the Abolition of the Slave Trade was finally passed in 1807.

A Lasting Legacy

The question of who or what should be credited for abolition is a matter of debate. The Zorg's influence, however, is powerfully evident in 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 public movement was unprecedented, serving as an affirmation to the power of moral courage, the pen, and unwavering persistence.

Kara's Narrative Method

In contrast to his previous books—such as the Pulitzer finalist Cobalt Red—Kara has had to fill in certain lacunae in the available documentation. At times, imaginative flourishes sit awkwardly next to rigorously researched accounts, giving the book a slightly chimeric feel. Part thriller and part serious nonfiction, The Zorg ultimately succeeds in illuminating one of history's darkest chapters, using compelling prose and documented fact to assemble a account that stays with the reader well after the final page.