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Over the course of nearly four centuries, the Atlantic slave trafficking system saw 12.5 million Africans trafficked from their homelands to the Americas. A staggering 1.8 million of those souls died during the voyage, enduring scarcely imaginable conditions of extreme confinement, filth, and illness. Some took their own lives by leaping 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 chronicles a harrowing incident aboard the namesake slave ship—the deliberate murder of 132 captive individuals by its British crew. The second story examines how this event 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 abolitionist activists. Among them was Olaudah Equiano, who wrote one of the few surviving 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 prosperity was accountable for 40% of Europe's slave trafficking. Investing in slavery was a highly profitable venture for everyone from the elites but also the common people. One such entrepreneur, William Gregson, accumulated his earnings from his trade, 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 commodities 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

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 at war with 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, on a slaving expedition, took aboard a disgraced British governor named Robert Stubbs, who had been removed for graft.

The Nightmare Passage

When Hanley arrived at Cape Coast Castle—a stronghold with a vast slave dungeon beneath it—he assumed control of the captured Zorg. He proceeded to grossly overload 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 captives, 17 crew members, and one depraved passenger: the former governor, Robert Stubbs.

Kara is particularly skilled at using historical documents to bring to life the collective nightmare of being trafficked on a slave ship.

The Zorg's journey was plagued with disaster. "The flux" swept through the vessel, followed by scurvy. The captain fell ill, 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 illustrate of the unmitigated terror. The graphic testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, details how the captives' skin was frequently rubbed raw 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 far from Jamaica and critically short on water. The crew made the decision to jettison a number of the enslaved Africans, who had already endured months of obscene 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. 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 several days, the crew drowned “those Africans who would be worth less at auction”—the infirm, 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 dissatisfied with the financial return 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 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.” Merely twelve days after the trial, an published essay appeared in a widely read English newspaper. The author, who claimed to have attended the court proceedings, argued compellingly against slavery, citing the Zorg case as a key illustration of its inherent evil. Olaudah Equiano saw the letter and took it to the abolitionist Granville Sharp, who petitioned for a new trial. At the subsequent hearing, the events on the Zorg were examined in forensic 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 convened. Over the subsequent years, they wrote letters, made speeches, organized campaigns, and meticulously documented 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 deserves credit for abolition remains 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 based on the events of 1781. While slavery has been widespread in human history, its abolition following a prolonged public movement was historic, serving as an testament to the power of moral courage, the pen, and relentless persistence.

The Author's Approach

Unlike his other work—such as the Pulitzer finalist Cobalt Red—Kara has had to address certain lacunae in the available documentation. Consequently, speculative passages contrast with rigorously researched accounts, giving the book a slightly hybrid feel. Part thriller and part serious nonfiction, The Zorg ultimately manages to shedding light on one of history's most horrific episodes, using compelling prose and meticulous research to assemble a account that stays with the reader long after the final page.