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Over the course of nearly four centuries, the Atlantic slave trafficking system resulted in 12.5 million Africans trafficked from their continent to the Americas. A devastating 1.8 million of those individuals perished during the voyage, subjected to unfathomable conditions of overcrowding, squalor, and illness. Some took their own lives by throwing themselves overboard, whereas still more were callously thrown into the sea.

A Tale of Two Stories

In The Zorg, author Siddharth Kara weaves together two parallel narratives. The first chronicles a horrific incident aboard the namesake slave ship—the deliberate murder of 132 enslaved Africans by its British crew. The second story examines how this event played a pivotal role in the abolition of the Atlantic slave trade in 1807, driven in large part by the relentless efforts of a coalition of abolitionist activists. Among them was Olaudah Equiano, who authored one of the rare first-person accounts of the Middle Passage, describing it as “a scene of horror almost inconceivable”.

The Roots in Liverpool

The tale originates in Liverpool, a port city that at the height of its prosperity was accountable for 40% of Europe's slave trade. Financing slavery was a lucrative venture for everyone from the elites to the working classes. One such investor, William Gregson, accumulated his earnings from rope-making, invested them into the slave trade, and eventually became a wealthy burgher and even mayor. Gregson financed the slave ship The William, which set sail from Liverpool for West Africa in October 1780 under Captain Richard Hanley. Its cargo was filled with trade goods like tobacco, firearms, knives, and so-called “India goods” such as chintz and cowrie shells—the latter 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 referred to by the British as the Zong) had left the Netherlands. With Britain at war with the Dutch in late 1780, the Royal Navy gave British ships authority to capture Dutch property at sea—a de facto license for piracy. The Zorg was soon taken by a British captain and held off the Gold Coast. Meanwhile, Captain Hanley, during one of his voyages, took aboard a disgraced British governor named Robert Stubbs, who had been removed for graft.

The Nightmare Passage

When Hanley arrived at Cape Coast Castle—a fortress with a notorious holding cell beneath it—he assumed control of the captured Zorg. He then grossly overload it with captives, placed a dozen of his own crew on board, and made Luke Collingwood, a ship's surgeon of questionable nautical skill, 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 excels in using contemporaneous sources to vividly reconstruct the collective nightmare of being transported on a slave ship.

The Zorg's journey was plagued with disaster. "The flux" swept through the vessel, followed by 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 masterfully utilizes eyewitness accounts to illustrate of the unmitigated terror. The powerful testimony of Alexander Falconbridge, a doctor who became an activist, describes how the captives' skin was frequently 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 far from Jamaica and dangerously short on water. The crew made the decision to jettison a number of the enslaved Africans, who had already endured months of appalling conditions below deck. This unspeakable act was not motivated by preserving life—the Africans had begged to be allowed to live, even without water rations—but by cold economic greed. Ship insurance policies did not cover losses 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 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 dissatisfied with the financial return on his venture. He submitted 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 won 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.” Just twelve days after the trial, an published essay appeared in a prominent English newspaper. The author, who claimed to have attended the court proceedings, made a powerful case against slavery, citing the Zorg case as a prime example of its inherent evil. Olaudah Equiano read the letter and brought it to the activist Granville Sharp, who petitioned for a new trial. At the following hearing, the events on the Zorg were examined in forensic detail, precisely what the abolitionists had hoped for.

The Road to 1807

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 petitioned, made speeches, lobbied tirelessly, 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 struggles, 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 remains contentious. The Zorg's influence, 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 mass campaign was historic, serving as an affirmation to the power of persistent activism, the pen, and relentless persistence.

The Author's Approach

Unlike his previous books—such as the Pulitzer finalist Cobalt Red—Kara has had to fill in certain gaps in the available documentation. At times, speculative passages sit awkwardly next to scrupulously factual accounts, giving the book a somewhat hybrid feel. Part thriller and part serious nonfiction, The Zorg nevertheless succeeds in shedding light on one of history's darkest chapters, using powerful storytelling and documented fact to create a account that haunts the reader long after the final page.