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Over the course of nearly four hundred years, the transatlantic slave trade saw 12.5 million Africans trafficked 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, filth, and illness. Some took their own lives by leaping overboard, while others were forcibly cast into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara presents two parallel narratives. The first details a harrowing incident aboard the eponymous slave ship—the systematic drowning 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, thanks largely by the dedicated work 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, calling it “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 responsible for 40% of Europe's slave trafficking. Investing in slavery was a lucrative venture for not just the elites but also the common people. One such investor, William Gregson, saved up 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 cargo was loaded with trade goods like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the latter being a standard rate 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 at war with the Dutch in late 1780, the Royal Navy granted British ships permission to seize Dutch property at sea—a de facto license for piracy. The Zorg was subsequently captured 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 removed for graft.

A Voyage into Hell

When Hanley reached Cape Coast Castle—a fortress with a notorious 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 appointed Luke Collingwood, a ship's surgeon of dubious 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 excels in using contemporaneous sources to bring to life the general hell of being transported on a slave ship.

The Zorg's journey was plagued with calamity. "The flux" swept through the vessel, followed by scurvy. The captain fell ill, became delirious, 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 sheer horror. The graphic testimony of Alexander Falconbridge, a doctor who became an activist, details how the captives' skin was often rubbed raw to the bone from being packed on bare wood, their flesh pinched and torn between the planks.

The Unspeakable Decision

By late November 1781, the Zorg was still miles 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 monstrous act was not motivated by preserving life—the Africans had begged to be spared, even without water rations—but by cold economic greed. Maritime insurance policies did not cover losses from disease, but they did cover cargo discarded out of “necessity” for the ship's safety. Over several days, the crew murdered “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.

Insurance and Injustice

Back in Liverpool, investor William Gregson was unhappy about the profit on his venture. He filed an insurance claim for £30 per drowned captive—a considerable 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 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 anonymous letter appeared in a widely read English newspaper. The author, who claimed to have attended the court proceedings, made a powerful case against slavery, using the Zorg case as a prime example of its brutality. Olaudah Equiano saw the letter and took it to the activist Granville Sharp, who petitioned for a new trial. At the following hearing, the events on the Zorg were reviewed in forensic detail, exactly what the abolitionists had hoped for.

A Sustained Campaign

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, orated, 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 setbacks, the Act for the Abolition of the Slave Trade was finally passed in 1807.

An Enduring Impact

The question of who or what should be credited for abolition is contentious. 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 near-universal in human history, its abolition following a sustained mass campaign was unprecedented, serving as an affirmation to the power of moral courage, the pen, and unwavering determination.

Kara's Narrative Method

In contrast to his other work—such as the acclaimed Cobalt Red—Kara has had to address certain gaps in the available documentation. Consequently, imaginative flourishes contrast with 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 compelling prose and documented fact to assemble a portrait that haunts the reader long after the final page.