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Over the course of nearly four centuries, the Atlantic slave trafficking system resulted in 12.5 million Africans forcibly taken from their continent to the Americas. A devastating 1.8 million of those individuals perished during the voyage, enduring scarcely imaginable conditions of extreme confinement, filth, and illness. Some chose to end their suffering by leaping overboard, whereas others were callously thrown into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara presents two interconnected narratives. The first details a harrowing incident aboard the namesake slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story examines how this event came to influence the abolition of the Atlantic slave trade in 1807, driven in large part by the dedicated work of a dazzling array 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 originates in Liverpool, a port city that at the peak of its economic power was responsible for 40% of Europe's slave trafficking. Financing slavery was a highly profitable venture for not just the wealthy to the common people. One such entrepreneur, William Gregson, accumulated his wages from rope-making, ploughed them into the slave trade, and rose to become 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 hold was filled 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 purchase 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 declaring war on the Dutch in late 1780, the Royal Navy gave British ships authority to capture Dutch ships at sea—a de facto license for privateering. The Zorg was subsequently captured by a British captain and anchored off the Gold Coast. Meanwhile, Captain Hanley, on a slaving expedition, took aboard a disgraced British governor named Robert Stubbs, who had been expelled for corruption.

The Nightmare Passage

When Hanley reached Cape Coast Castle—a fortress with a notorious holding cell beneath it—he took command of the captured Zorg. He then severely overcrowd it with enslaved people, put a dozen of his own crew on board, and appointed Luke Collingwood, a ship's surgeon of dubious seamanship, 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 historical documents to bring to life the collective nightmare of being trafficked on a slave ship.

The Zorg's journey was fraught with calamity. Dysentery ravaged 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 eyewitness accounts to illustrate of the unmitigated terror. The powerful testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, details how the captives' skin was often rubbed raw 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 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 monstrous act was not motivated by preserving life—the Africans had begged to be spared, even without water rations—but by cold economic greed. Ship insurance policies did not cover losses from disease, but they did cover cargo jettisoned 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, even 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 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 anonymous letter appeared in a widely read English newspaper. The author, who claimed to have attended the court proceedings, argued compellingly against slavery, using the Zorg case as a prime example of its inherent evil. Olaudah Equiano read the letter and brought 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 wanted.

A Sustained Campaign

In the spring of 1787, the founding members of the Society for Effecting the Abolition of the Slave Trade first met. Over the subsequent years, they wrote letters, orated, lobbied tirelessly, 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 setbacks, the Act for the Abolition of the Slave Trade was finally passed in 1807.

An Enduring Impact

The debate over who or what should be credited for abolition remains contentious. The Zorg's legacy, 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 widespread in human history, its abolition following a sustained public movement was unprecedented, serving as an testament to the power of persistent activism, 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 address certain gaps in the available documentation. Consequently, speculative passages contrast with rigorously researched accounts, giving the book a slightly chimeric feel. Part thriller and part serious nonfiction, The Zorg nevertheless succeeds in shedding light on one of history's most horrific episodes, using compelling prose and documented fact to assemble a account that haunts the reader well after the final page.