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Over the course of nearly four centuries, the transatlantic slave trade saw 12.5 million Africans trafficked from their continent to the Americas. A devastating 1.8 million of those souls perished during the voyage, enduring scarcely imaginable conditions of extreme confinement, squalor, and disease. Some chose to end their suffering by leaping overboard, while others were callously thrown into the sea.

A Tale of Two Stories

In The Zorg, author Siddharth Kara weaves together two interconnected narratives. The first chronicles a horrific incident aboard the eponymous slave ship—the systematic drowning of 132 enslaved Africans by its British crew. The second story examines how this event played a pivotal role in the ending of the Atlantic slave trade in 1807, thanks largely by the relentless efforts of a dazzling array of abolitionist activists. 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”.

The Roots in Liverpool

The account begins in Liverpool, a port city that at the height of its prosperity was accountable for 40% of Europe's slave trafficking. Financing slavery was a highly profitable venture for everyone from the elites but also the working classes. One such entrepreneur, William Gregson, saved up his earnings from his trade, invested them into the slave trade, and rose to become a wealthy burgher and even mayor. Gregson financed the slave ship The William, which departed from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its cargo was filled with commodities like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the shells being a common currency in the acquisition of enslaved people.

The Capture of the Zorg

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 property at sea—a virtual 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 expelled for graft.

A Voyage into Hell

When Hanley arrived at Cape Coast Castle—a stronghold with a vast holding cell beneath it—he assumed control of the captured Zorg. He then 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 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 historical documents to vividly reconstruct the general hell of being trafficked on a slave ship.

The Zorg's journey was fraught with calamity. Dysentery 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 powerful testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, describes how the enslaved people's skin was often rubbed raw to the bone from being packed on bare wood, their flesh caught between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was still far from Jamaica and dangerously short on water. The crew resolved to throw overboard a number of the enslaved Africans, who had already suffered through months of obscene conditions below deck. This monstrous act was not motivated by ensuring survival—the Africans had begged to be allowed to live, even without water rations—but by pure 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 drowned “those Africans who would be worth less at auction”—the weak, the sick, including women and children, among them 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 refused to pay. In March 1783, Gregson sued 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.” Just twelve days after the trial, an anonymous letter appeared in a widely read English newspaper. The author, who claimed to have attended 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 brought it to the abolitionist Granville Sharp, who filed a motion for a new trial. At the subsequent hearing, the events on the Zorg were examined in meticulous detail, precisely what the abolitionists had hoped for.

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, made speeches, organized campaigns, and gathered evidence on the realities 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 should be credited for abolition remains contentious. 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 sustained public movement was unprecedented, serving as an affirmation to the power of persistent activism, the pen, and relentless determination.

The Author's Approach

Unlike his previous books—such as the acclaimed Cobalt Red—Kara has had to fill in certain lacunae in the historical record. At times, imaginative flourishes sit awkwardly next to scrupulously factual accounts, giving the book a slightly chimeric feel. Part thriller and part serious nonfiction, The Zorg ultimately manages to illuminating one of history's most horrific episodes, using powerful storytelling and documented fact to create a account that stays with the reader well after the final page.