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Over the course of nearly four centuries, the transatlantic slave trade saw 12.5 million Africans trafficked from their homelands to the Americas. A staggering 1.8 million of those souls perished during the Middle Passage, enduring scarcely imaginable conditions of overcrowding, filth, and disease. Some chose to end their suffering by leaping overboard, while others were callously thrown into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara weaves together two interconnected narratives. The first details a horrific incident aboard the namesake slave ship—the systematic drowning of 132 enslaved Africans by its British crew. The second story explores how this event played a pivotal role in the ending 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 wrote 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 begins in Liverpool, a port city that at the height of its prosperity was responsible for 40% of Europe's slave trafficking. Financing slavery was a highly profitable venture for not just the wealthy but also 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 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 standard rate 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 departed the Netherlands. With Britain at war with the Dutch in late 1780, the Royal Navy gave British ships authority to seize Dutch ships at sea—a virtual license for piracy. The Zorg was soon taken 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 arrived at Cape Coast Castle—a stronghold 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 appointed Luke Collingwood, a ship's surgeon of questionable seamanship, its captain. In August 1781, the Zorg left Accra carrying 442 enslaved Africans, 17 crew members, and one notorious passenger: the former governor, Robert Stubbs.

Kara is particularly skilled at using historical documents to vividly reconstruct the general hell of being trafficked on a slave ship.

The Zorg's journey was fraught with calamity. Dysentery swept through the vessel, and then scurvy. The captain succumbed to sickness, lost his senses, 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 paint a picture of the sheer horror. The powerful testimony of Alexander Falconbridge, a doctor who became an activist, describes how the enslaved people's skin was often rubbed raw 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 far from Jamaica and critically short on water. The crew resolved to throw overboard a number of the enslaved Africans, who had already suffered through months of obscene conditions below deck. This unspeakable act was not motivated by ensuring survival—the Africans had begged to be spared, 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 several days, the crew drowned “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 unhappy about the financial return 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 took them to court and was awarded a trial by jury, with his lawyers arguing 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.” Merely twelve days after the trial, an published essay appeared in a prominent English newspaper. The author, who claimed to have attended the court proceedings, argued compellingly against slavery, using the Zorg case as a key illustration of its inherent evil. Olaudah Equiano saw the letter and took it to the activist Granville Sharp, who petitioned 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 following 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 should be credited for abolition is a matter of debate. 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 moral courage, the pen, and unwavering determination.

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 historical record. Consequently, speculative passages contrast with rigorously researched accounts, giving the book a slightly chimeric feel. Part thriller and part serious nonfiction, The Zorg ultimately succeeds in shedding light on one of history's most horrific episodes, using compelling prose and meticulous research to create a account that stays with the reader well after the final page.