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Over the spanning nearly four centuries, the Atlantic slave trafficking system resulted in 12.5 million Africans trafficked from their continent to the Americas. A devastating 1.8 million of those individuals perished during the Middle Passage, enduring unfathomable conditions of extreme confinement, filth, and illness. Many chose to end their suffering by throwing themselves overboard, whereas still more were callously thrown into the sea.

A Tale of Two Stories

In The Zorg, author Siddharth Kara weaves together two parallel narratives. The first chronicles a horrific incident aboard the namesake slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story examines how this atrocity came to influence the abolition of the Atlantic slave trade in 1807, thanks largely by the relentless efforts of a dazzling array of committed campaigners. Among them was Olaudah Equiano, who authored one of the rare first-person accounts of the Middle Passage, describing it as “a scene of horror almost inconceivable”.

The Roots in Liverpool

The tale begins in Liverpool, a port city that at the height of its economic power was responsible for 40% of Europe's slave trafficking. Financing slavery was a lucrative venture for not just the wealthy but also the working classes. One such entrepreneur, William Gregson, saved up his wages from rope-making, invested 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 filled with commodities like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the latter being a common currency in the purchase of enslaved people.

A Ship Seized

Around the same time, a Dutch slave vessel named the Zorg (later referred to by the British as the Zong) had left the Netherlands. With Britain at war with the Dutch in late 1780, the Royal Navy gave 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 held off the Gold Coast. Meanwhile, Captain Hanley, on a slaving expedition, picked up a disgraced British governor named Robert Stubbs, who had been expelled for graft.

The Nightmare Passage

When Hanley reached Cape Coast Castle—a fortress with a notorious slave dungeon beneath it—he took command of the captured Zorg. He proceeded to severely overcrowd it with captives, put a dozen of his own crew on board, and made 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 vividly reconstruct the collective nightmare of being trafficked on a slave ship.

The Zorg's journey was plagued with disaster. Dysentery swept through the vessel, and then 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 effectively employs eyewitness accounts to illustrate of the unmitigated terror. The powerful testimony of Alexander Falconbridge, a doctor who became an activist, details how the enslaved people's skin was frequently worn down to the bone from lying on bare wood, their flesh caught between the planks.

A Calculated Atrocity

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 captives, who had already endured months of appalling conditions below deck. This unspeakable act was not motivated by preserving life—the Africans had pleaded to be allowed to live, even without water rations—but by pure economic greed. Maritime insurance policies did not cover deaths from disease, but they did cover cargo jettisoned 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 profit on his venture. He submitted an insurance claim for £30 per lost slave—a considerable sum in today's money. The insurers declined to pay. In March 1783, Gregson took them to court and was awarded a trial by jury, with his lawyers claiming 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 key illustration of its brutality. Olaudah Equiano saw the letter and took it to the abolitionist Granville Sharp, who filed a motion for a new trial. At the following hearing, the events on the Zorg were examined in forensic detail, precisely 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 first met. Over the following years, they petitioned, 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 struggles, the Act for the Abolition of the Slave Trade was enacted in 1807.

An Enduring Impact

The debate over who or what should be credited for abolition remains a matter of debate. The Zorg's legacy, however, is powerfully 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 mass campaign was historic, serving as an affirmation to the power of persistent activism, the pen, and unwavering determination.

Kara's Narrative Method

Unlike his other work—such as the acclaimed Cobalt Red—Kara has had to fill in certain lacunae in the available documentation. At times, speculative passages contrast with rigorously researched accounts, giving the book a slightly hybrid feel. Part thriller and part historical analysis, The Zorg nevertheless manages to shedding light on one of history's darkest chapters, using powerful storytelling and documented fact to create a portrait that stays with the reader long after the final page.