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Over the spanning nearly four hundred years, the Atlantic slave trafficking system saw 12.5 million Africans trafficked from their homelands to the Americas. A staggering 1.8 million of those souls perished during the voyage, enduring scarcely imaginable conditions of extreme confinement, filth, and illness. Many chose to end their suffering by throwing themselves overboard, whereas others were forcibly cast into the sea.

Two Interwoven Narratives

In The Zorg, author Siddharth Kara weaves together two interconnected narratives. The first chronicles a horrific incident aboard the eponymous 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, driven in large part by the relentless efforts of a dazzling array of abolitionist activists. 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 tale originates in Liverpool, a port city that at the height of its prosperity was accountable for 40% of Europe's slave trafficking. Financing slavery was a highly profitable venture for not just the elites to the common people. One such investor, William Gregson, saved up his wages from rope-making, ploughed them into the slave trade, and eventually became a prominent citizen and even mayor. Gregson financed 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 various “India goods” such as chintz and cowrie shells—the latter being a common currency in the acquisition of human beings.

The Capture of the Zorg

Concurrently, a Dutch slave vessel named the Zorg (later referred to 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 property at sea—a virtual license for piracy. The Zorg was soon captured by a British captain and anchored off the Gold Coast. Meanwhile, Captain Hanley, during one of his voyages, took aboard a disgraced British governor named Robert Stubbs, who had been expelled for graft.

The Nightmare Passage

When Hanley arrived at Cape Coast Castle—a stronghold with a vast holding cell beneath it—he assumed control of the captured Zorg. He then severely overcrowd it with enslaved people, placed a dozen of his own crew on board, and appointed Luke Collingwood, a ship's surgeon of dubious nautical skill, 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 excels in using contemporaneous sources to vividly reconstruct the general hell of being trafficked on a slave ship.

The Zorg's journey was plagued with disaster. Dysentery ravaged the vessel, followed by scurvy. The captain fell ill, lost his senses, 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 frequently worn down 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 still far from Jamaica and critically short on water. The crew resolved to jettison a number of the captives, who had already suffered through 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 pure economic greed. Maritime insurance policies did not cover deaths from natural causes, but they would pay for cargo discarded out of “necessity” for the ship's safety. Over several days, the crew murdered “those Africans who would be worth less at auction”—the infirm, the sick, including women and children, among them 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 substantial 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.”

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, citing the Zorg case as a prime example of its brutality. Olaudah Equiano read the letter and brought it to the abolitionist Granville Sharp, who petitioned for a new trial. At the following hearing, the events on the Zorg were examined 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 subsequent years, they wrote letters, made speeches, organized campaigns, 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 setbacks, the Act for the Abolition of the Slave Trade was enacted in 1807.

A Lasting Legacy

The debate over 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 prolonged public movement was unprecedented, serving as an affirmation to the power of moral courage, the pen, and relentless determination.

Kara's Narrative Method

Unlike his previous books—such as the Pulitzer finalist Cobalt Red—Kara has had to fill in certain gaps in the historical record. Consequently, imaginative flourishes sit awkwardly next to scrupulously factual accounts, giving the book a slightly chimeric feel. Part thriller and part historical analysis, The Zorg nevertheless manages to illuminating one of history's darkest chapters, using compelling prose and documented fact to assemble a portrait that haunts the reader well after the final page.