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Over the course of nearly four centuries, the transatlantic slave trade resulted in 12.5 million Africans forcibly taken from their homelands to the Americas. A devastating 1.8 million of those souls perished during the Middle Passage, enduring unfathomable conditions of extreme confinement, squalor, and disease. Many chose to end their suffering by throwing themselves overboard, while still more were callously thrown into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara weaves together two parallel narratives. The first details a horrific incident aboard the namesake slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story explores how this atrocity came to influence the abolition of the Atlantic slave trade in 1807, driven in large part by the relentless efforts of a coalition of committed campaigners. Among them was Olaudah Equiano, who wrote one of the rare first-person narratives of the Middle Passage, describing it as “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 trade. Financing slavery was a lucrative venture for not just the wealthy but also the working classes. One such investor, William Gregson, saved up his wages from rope-making, invested them into the slave trade, and eventually became a prominent citizen 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 latter being a common currency in the acquisition of enslaved people.

A Ship Seized

Concurrently, a Dutch slave vessel named the Zorg (later referred to by the British as the Zong) had departed 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 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, took aboard a disgraced British governor named Robert Stubbs, who had been expelled for corruption.

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 severely overcrowd it with enslaved people, put 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 finally left Accra carrying 442 captives, 17 crew members, and one depraved passenger: the former governor, Robert Stubbs.

Kara excels in using contemporaneous sources to vividly reconstruct the general hell of being trafficked on a slave ship.

The Zorg's journey was fraught with disaster. "The flux" ravaged 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 masterfully utilizes period testimonies to illustrate of the unmitigated terror. The powerful testimony of Alexander Falconbridge, a doctor who became an activist, details how the captives' skin was frequently rubbed raw to the bone from being packed on bare wood, their flesh pinched and torn between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was far from Jamaica and critically short on water. The crew made the decision to jettison a number of the enslaved Africans, who had already suffered through months of obscene conditions below deck. This monstrous 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. Ship insurance policies did not cover deaths from natural causes, but they would pay for cargo jettisoned out of “necessity” for the ship's safety. Over a period of days, the crew drowned “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.

Insurance and Injustice

Back in Liverpool, investor William Gregson was dissatisfied with the profit on his investment. He filed 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 anonymous letter appeared in a widely read English newspaper. The author, who claimed to have been present the court proceedings, argued compellingly against slavery, using the Zorg case as a key illustration of its brutality. 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 examined in meticulous detail, exactly 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, made speeches, lobbied tirelessly, and meticulously documented the realities 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 finally passed in 1807.

A Lasting Legacy

The question of who or what deserves credit for abolition remains a matter of debate. The Zorg's influence, however, is visibly evident in J.M.W. Turner's famous painting, The Slave Ship, which was inspired by 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 unwavering determination.

Kara's Narrative Method

In contrast to his previous books—such as the acclaimed 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 somewhat chimeric feel. A blend of narrative suspense and part serious nonfiction, The Zorg ultimately manages to illuminating one of history's most horrific episodes, using compelling prose and documented fact to create a account that haunts the reader well after the final page.