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Over the course of nearly four hundred years, the Atlantic slave trafficking system resulted in 12.5 million Africans trafficked from their homelands to the Americas. A staggering 1.8 million of those individuals perished during the voyage, enduring unfathomable conditions of overcrowding, filth, and illness. Many took their own lives by leaping overboard, whereas still more were callously thrown into the sea.

Two Interwoven Narratives

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 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, driven in large part by the relentless efforts of a coalition of abolitionist activists. Among them was Olaudah Equiano, who authored one of the few surviving first-person accounts of the Middle Passage, describing it as “a scene of horror almost inconceivable”.

Liverpool's Central Role

The account originates in Liverpool, a port city that at the height of its prosperity was accountable for 40% of Europe's slave trade. Financing slavery was a lucrative venture for everyone from the wealthy to the working classes. One such entrepreneur, William Gregson, saved up his wages from his trade, ploughed them into the slave trade, and rose to become a wealthy burgher and even mayor. Gregson provided the funds for the slave ship The William, which set sail from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its hold 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 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 declaring war on the Dutch in late 1780, the Royal Navy granted British ships authority to seize Dutch property at sea—a virtual license for privateering. The Zorg was soon taken by a British captain and held off the Gold Coast. Meanwhile, Captain Hanley, during one of his voyages, took aboard a fleeing British governor named Robert Stubbs, who had been removed for corruption.

A Voyage into Hell

When Hanley arrived at Cape Coast Castle—a fortress with a notorious holding cell beneath it—he took command of the captured Zorg. He then grossly overload it with captives, put a dozen of his own crew on board, and made 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 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 calamity. "The flux" ravaged 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 period testimonies to illustrate of the sheer horror. The graphic testimony of Alexander Falconbridge, a doctor who became an activist, details 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 dangerously short on water. The crew made the decision to throw overboard a number of the captives, who had already suffered through months of appalling 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 deaths from disease, 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 weak, the sick, including 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 venture. He filed an insurance claim for £30 per lost slave—a considerable sum in today's money. The insurers refused to pay. In March 1783, Gregson sued 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.” Just twelve days after the trial, an published essay appeared in a prominent English newspaper. The author, who claimed to have attended the court proceedings, made a powerful case 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 filed a motion 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 founding members of the Society for Effecting the Abolition of the Slave Trade convened. Over the following years, they wrote letters, made speeches, organized campaigns, 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 struggles, 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 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 prolonged public movement was unprecedented, serving as an testament to the power of moral courage, the pen, and unwavering persistence.

Kara's Narrative Method

In contrast to his other work—such as the acclaimed Cobalt Red—Kara has had to address certain lacunae in the available documentation. At times, speculative passages contrast with rigorously researched accounts, giving the book a slightly chimeric feel. A blend of narrative suspense and part serious nonfiction, The Zorg ultimately succeeds in illuminating one of history's darkest chapters, using compelling prose and meticulous research to assemble a portrait that haunts the reader long after the final page.