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Over the course of nearly four centuries, the Atlantic slave trafficking system saw 12.5 million Africans trafficked from their continent to the Americas. A staggering 1.8 million of those individuals died during the voyage, enduring unfathomable conditions of overcrowding, filth, and illness. Some chose to end their suffering by leaping overboard, whereas others were forcibly cast into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara presents two parallel narratives. The first chronicles a harrowing incident aboard the namesake slave ship—the systematic drowning of 132 captive individuals 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 dedicated work of a coalition of committed campaigners. Among them was Olaudah Equiano, who wrote 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 tale originates 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 everyone from the elites to the common people. One such entrepreneur, William Gregson, saved up his earnings from rope-making, invested 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 standard rate in the purchase of enslaved people.

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 permission to seize Dutch ships at sea—a de facto sanctioning of privateering. The Zorg was soon 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.

The Nightmare Passage

When Hanley reached Cape Coast Castle—a fortress with a vast holding cell beneath it—he took command of the captured Zorg. He then severely overcrowd it with enslaved people, placed 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 enslaved Africans, 17 crew members, and one depraved passenger: the former governor, Robert Stubbs.

Kara is particularly skilled at using contemporaneous sources to vividly reconstruct the collective nightmare of being trafficked on a slave ship.

The Zorg's journey was plagued with disaster. "The flux" ravaged the vessel, and then scurvy. The captain succumbed to sickness, lost his senses, and appointed Stubbs. Thus, “a ship full of decay and death was being commanded by a passenger.” Kara masterfully utilizes eyewitness accounts to illustrate of the unmitigated terror. The graphic testimony of Alexander Falconbridge, a ship's surgeon turned abolitionist, describes how the enslaved people's skin was frequently worn down to the bone from being packed on bare wood, their flesh caught between the planks.

A Calculated Atrocity

By late November 1781, the Zorg was far from Jamaica and dangerously short on water. The crew resolved to throw overboard a number of the captives, 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 spared, even without water rations—but by cold economic greed. Maritime insurance policies did not cover losses from natural causes, but they did cover cargo discarded 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 infirm, the sick, along with women and children, even a baby born during the voyage.

Insurance and Injustice

Back in Liverpool, investor William Gregson was dissatisfied with the profit on his investment. He submitted an insurance claim for £30 per lost slave—a substantial sum in today's money. The insurers declined 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 prominent English newspaper. The author, who claimed to have been present the court proceedings, made a powerful case against slavery, citing the Zorg case as a key illustration 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 subsequent hearing, the events on the Zorg were reviewed in meticulous detail, precisely 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 convened. Over the following years, they wrote letters, orated, organized campaigns, 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.

A Lasting Legacy

The debate over who or what should be credited for abolition is a matter of debate. The Zorg's legacy, however, is visibly captured by J.M.W. Turner's famous painting, The Slave Ship, which was inspired by 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 determination.

The Author's Approach

In contrast to his previous books—such as the acclaimed Cobalt Red—Kara has had to fill in certain gaps in the available documentation. Consequently, speculative passages sit awkwardly next to scrupulously factual 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 darkest chapters, using compelling prose and documented fact to assemble a account that stays with the reader well after the final page.