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Over the course of nearly four hundred years, the Atlantic slave trafficking system saw 12.5 million Africans forcibly taken from their continent to the Americas. A devastating 1.8 million of those individuals perished during the voyage, enduring unfathomable conditions of overcrowding, filth, and illness. Some chose to end their suffering by throwing themselves overboard, whereas 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 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 played a pivotal role in the ending of the Atlantic slave trade in 1807, thanks largely by the relentless efforts of a coalition of committed campaigners. Among them was Olaudah Equiano, who authored one of the few surviving first-person accounts of the Middle Passage, calling it “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. Investing in slavery was a highly profitable venture for everyone from the wealthy to the common people. One such entrepreneur, William Gregson, accumulated his wages from rope-making, invested them into the slave trade, and eventually became a wealthy burgher and later mayor. Gregson provided the funds for the slave ship The William, which departed 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 latter being a standard rate in the acquisition 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 departed the Netherlands. With Britain declaring war on the Dutch in late 1780, the Royal Navy gave British ships authority to capture Dutch ships at sea—a virtual license for privateering. The Zorg was subsequently taken by a British captain and anchored off the Gold Coast. Meanwhile, Captain Hanley, on a slaving expedition, picked up a disgraced British governor named Robert Stubbs, who had been expelled for graft.

A Voyage into Hell

When Hanley reached Cape Coast Castle—a stronghold with a vast holding cell beneath it—he assumed control of the captured Zorg. He proceeded to severely overcrowd it with captives, 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 finally 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 general hell of being transported on a slave ship.

The Zorg's journey was plagued with disaster. "The flux" swept through the vessel, followed by scurvy. The captain succumbed to sickness, lost his senses, and handed command over to Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara effectively employs eyewitness accounts to paint a picture of the unmitigated terror. The graphic testimony of Alexander Falconbridge, a doctor who became an activist, details how the enslaved people's skin was often worn down to the bone from lying on bare wood, their flesh caught between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was far from Jamaica and dangerously short on water. The crew resolved to jettison a number of the captives, who had already suffered through months of appalling 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 cold 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, along with 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 lost slave—a substantial sum in today's money. The insurers refused to pay. In March 1783, Gregson took them to court and was awarded 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 published essay 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 prime example of its inherent evil. Olaudah Equiano saw the letter and brought it to the abolitionist Granville Sharp, who petitioned for a new trial. At the following hearing, the events on the Zorg were reviewed in meticulous detail, exactly 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 convened. Over the subsequent years, they wrote letters, made speeches, lobbied tirelessly, 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 setbacks, the Act for the Abolition of the Slave Trade was finally passed in 1807.

An Enduring Impact

The question of who or what deserves credit 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 prolonged mass campaign was unprecedented, serving as an affirmation to the power of moral courage, the pen, and unwavering persistence.

The Author's Approach

Unlike his other work—such as the acclaimed Cobalt Red—Kara has had to fill in certain gaps in the historical record. At times, imaginative flourishes sit awkwardly next to rigorously researched accounts, giving the book a somewhat hybrid feel. Part thriller and part serious nonfiction, The Zorg nevertheless succeeds in illuminating one of history's darkest chapters, using compelling prose and documented fact to assemble a portrait that stays with the reader long after the final page.