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Over the course of nearly four centuries, the transatlantic slave trade saw 12.5 million Africans forcibly taken from their continent to the Americas. A staggering 1.8 million of those individuals died during the Middle Passage, subjected to unfathomable conditions of overcrowding, squalor, and illness. Many took their own lives by throwing themselves 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 details a harrowing incident aboard the eponymous slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story explores how this event came to influence the ending of the Atlantic slave trade in 1807, driven in large part by the relentless efforts of a dazzling array 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”.

Liverpool's Central Role

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 highly profitable venture for everyone from the wealthy but also the working classes. One such investor, William Gregson, accumulated his wages from his trade, ploughed them into the slave trade, and eventually became a wealthy burgher 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 cargo was filled with commodities like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the shells 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 at war with the Dutch in late 1780, the Royal Navy granted British ships permission to capture Dutch property at sea—a de facto sanctioning of privateering. The Zorg was soon captured by a British captain and held off the Gold Coast. Meanwhile, Captain Hanley, during one of his voyages, 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 fortress with a vast slave dungeon 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 made Luke Collingwood, a ship's surgeon of dubious seamanship, 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 is particularly skilled at using contemporaneous sources to vividly reconstruct the general hell of being transported on a slave ship.

The Zorg's journey was fraught with disaster. 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 paint a picture 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 lying on bare wood, their flesh caught between the planks.

The Unspeakable Decision

By late November 1781, the Zorg was miles from Jamaica and critically short on water. The crew made the decision 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 pleaded to be allowed to live, even without water rations—but by pure economic greed. Ship insurance policies did not cover deaths from disease, but they would pay for cargo discarded out of “necessity” for the ship's safety. Over a period of days, the crew murdered “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 dissatisfied with the profit on his venture. He submitted an insurance claim for £30 per lost slave—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 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 prime example of its inherent evil. Olaudah Equiano read the letter and brought it to the activist Granville Sharp, who petitioned for a new trial. At the following hearing, the events on the Zorg were examined in forensic detail, exactly what the abolitionists had hoped for.

The Road to 1807

In the spring of 1787, the founding members of the Society for Effecting the Abolition of the Slave Trade convened. Over the subsequent years, they wrote letters, made speeches, 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 enacted in 1807.

A Lasting Legacy

The question of who or what deserves credit 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 based on the events of 1781. While slavery has been near-universal in human history, its abolition following a sustained public movement was historic, serving as an testament 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 address certain lacunae in the available documentation. Consequently, imaginative flourishes sit awkwardly next to scrupulously factual accounts, giving the book a slightly chimeric feel. A blend of narrative suspense and part serious nonfiction, The Zorg nevertheless manages to illuminating one of history's darkest chapters, using powerful storytelling and documented fact to create a portrait that stays with the reader well after the final page.