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Over the spanning 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 perished during the voyage, enduring scarcely imaginable conditions of extreme confinement, filth, and illness. Some took their own lives by leaping overboard, whereas still more 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 namesake 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, driven in large part by the dedicated work of a coalition of committed campaigners. Among them was Olaudah Equiano, who authored 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 economic power was responsible for 40% of Europe's slave trade. Investing in slavery was a lucrative venture for not just the wealthy to the working classes. One such entrepreneur, 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 provided the funds for the slave ship The William, which departed 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 common currency in the acquisition of human beings.

The Capture of the Zorg

Concurrently, a Dutch slave vessel named the Zorg (later referred to by the British as the Zong) had departed the Netherlands. With Britain declaring war on the Dutch in late 1780, the Royal Navy granted British ships permission to capture Dutch ships at sea—a de facto sanctioning of privateering. The Zorg was soon captured by a British captain and anchored off the Gold Coast. Meanwhile, Captain Hanley, during one of his voyages, picked up a disgraced British governor named Robert Stubbs, who had been removed for corruption.

The Nightmare Passage

When Hanley reached Cape Coast Castle—a fortress with a notorious holding cell beneath it—he assumed control of the captured Zorg. He proceeded to grossly overload it with enslaved people, placed a dozen of his own crew on board, and appointed Luke Collingwood, a ship's surgeon of questionable nautical skill, its captain. In August 1781, the Zorg left Accra carrying 442 captives, 17 crew members, and one depraved passenger: the former governor, Robert Stubbs.

Kara is particularly skilled at using contemporaneous sources 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 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 paint a picture of the unmitigated terror. The graphic testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, details how the captives' skin was frequently worn down to the bone from lying 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 dangerously 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 monstrous act was not motivated by ensuring survival—the Africans had pleaded to be allowed to live, even without water rations—but by cold economic greed. Maritime insurance policies did not cover deaths from natural causes, but they did cover 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, 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 financial return on his investment. He submitted an insurance claim for £30 per drowned captive—a considerable sum in today's money. The insurers declined to pay. In March 1783, Gregson sued and won a trial by jury, with his lawyers arguing 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 prominent English newspaper. The author, who claimed to have been present the court proceedings, made a powerful case against slavery, using the Zorg case as a key illustration of its brutality. Olaudah Equiano saw the letter and took it to the activist Granville Sharp, who petitioned for a new trial. At the subsequent hearing, the events on the Zorg were reviewed in forensic detail, exactly 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 convened. Over the following years, they petitioned, made speeches, organized campaigns, 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 struggles, the Act for the Abolition of the Slave Trade was enacted in 1807.

An Enduring Impact

The question of who or what deserves credit for abolition is contentious. 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 prolonged mass campaign was historic, serving as an testament to the power of moral courage, the pen, and relentless determination.

The Author's Approach

In contrast to his previous books—such as the Pulitzer finalist Cobalt Red—Kara has had to fill in certain gaps in the historical record. Consequently, imaginative flourishes contrast with scrupulously factual 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 haunts the reader well after the final page.