Tom Rob Smith’s historical thriller, Child 44 (2008), is the first novel in the Leo Demidov trilogy. Set in the post-World War II Soviet Union, the story follows Leo Demidov, a decorated war hero and idealistic MGB (secret police) officer. When a series of brutal child murders surfaces, Leo’s attempt to investigate puts him in direct conflict with a state that officially denies the existence of such crimes. Demoted and exiled, Leo must hunt a vicious killer while simultaneously being hunted by the regime he once loyally served. The novel explores themes of State Ideology as an Obstacle to Justice, The Perversion of Love and Trust in a Police State, and The Cycle of State-Sponsored Trauma and Violence.

The novel was an international bestseller, longlisted for the Man Booker Prize, and won the CWA Ian Fleming Steel Dagger Award. In 2015, Child 44 was adapted into a film starring Tom Hardy and Gary Oldman.

This guide refers to the 2011 Grand Central Publishing trade paperback edition.

Content Warning: The source text and this guide contain depictions of graphic violence, child death, child abuse, death by suicide, animal death, animal cruelty, substance use, addiction, suicidal ideation, sexual content, sexual harassment, sexual violence, physical abuse, child sexual abuse, ableism, rape, mental illness, and antigay bias.

Plot Summary

The novel opens in 1933 in the Ukrainian village of Chervoy, where a government-engineered famine has reduced the population to starvation. A 10-year-old boy named Pavel and his nearly eight-year-old brother, Andrei, who is clumsy and severely nearsighted, venture into the forest at their mother Oksana’s instruction to hunt a cat. Pavel teaches Andrei to set string snares baited with bones. Together, the brothers kill the cat, but when they separate to collect firewood, a man charges from the darkness and attacks Pavel. Andrei discovers blood in the snow but no sign of his brother, and Oksana later tells Andrei that the man must have taken Pavel for food.

Twenty years later, in February 1953, Leo Stepanovich Demidov is a decorated 30-year-old war hero working as an MGB officer in Moscow. He is dispatched to manage a delicate situation: Arkady, the four-year-old son of a subordinate named Fyodor Andreev, has been found dead on the railway tracks. The official report declares the death an accident, but Fyodor’s family insists that the boy was murdered, found naked with his mouth stuffed with dirt. An eyewitness named Galina Shaporina arrives but, terrified by Leo’s MGB presence, recants her account. Leo considers the matter resolved.

Meanwhile, Leo has been surveilling a veterinarian named Anatoly Brodsky, suspected of espionage. When Brodsky escapes, Leo traces him to the village of Kimov, where the man has sought refuge with Mikhail Zinoviev, an old friend whose life Brodsky once saved during the war. Leo leads an armed team through a blizzard, while his ambitious deputy, Vasili Nikitin, works to undermine him. Brodsky attempts to die by suicide by breaking through the ice of a frozen river; Leo dives in and saves him. Later, Vasili executes Zinoviev and his wife in front of their two young daughters. Leo draws his gun on Vasili to protect the children and takes the orphaned girls back to Moscow, placing them in a state orphanage.

At the Lubyanka MGB headquarters, Leo oversees Brodsky’s interrogation. A psychiatrist injects Brodsky with camphor oil to induce seizures, a technique designed to strip away the capacity for deception. Under the drug, Brodsky repeats only the names of his veterinary clients, convincing Leo that the man is innocent. A deep crack opens in Leo’s faith in the system. Days later, Brodsky is executed after signing a coerced confession. Leo’s mentor, Major Kuzmin, assigns Leo to investigate the seventh name from the confession: his wife, Raisa, a schoolteacher. Leo suspects Vasili’s interference and accepts the case, hoping to clear Raisa’s name, but discovers a second MGB agent tailing him, confirming that his own loyalty is under scrutiny. During a search of their apartment, Leo finds a hollow copper coin, a device used for smuggling microfilm, hidden among Raisa’s clothes. He is unsure of whether it was planted there to test him but ultimately declares his wife innocent.

Three weeks of house arrest follow, with Stalin’s death delaying Leo and Raisa’s sentencing. Eventually, they are taken to the train station, where Vasili explains that Leo has been demoted to the lowest militia rank and exiled to Voualsk, a factory town in the Ural Mountains. On the train, Raisa upbraids Leo for his work arresting innocent people. When Leo asks if she has ever loved him, Raisa doesn’t respond.

In Voualsk, General Nesterov, the local militia chief, presents Leo with photographs of a murdered 14-year-old girl named Larisa Petrova, found naked in the forest with her mouth stuffed with soil and her torso savaged. Leo immediately notices parallels to Arkady’s death. With the help of Doctor Tyapkin, a transferred Moscow physician, Leo discovers that Larisa’s stomach was surgically removed, a detail absent from the official report. String is tied around the girl’s ankle, and the frozen crime scene contains no loose soil, meaning the killer brought the material deliberately. Leo and Raisa search the surrounding forest and find the body of a young boy murdered identically: naked, stomach removed, mouth stuffed with ground-up bark, string around his ankle.

Nesterov refuses to connect the two murders. A teenager with cognitive disabilities is suspected of Larisa’s death, having been found with a lock of her hair. Now, Nesterov launches a citywide roundup of men who have been sexually involved with other men. Over 150 men are arrested, but the investigation yields no murderer. Leo confronts Nesterov, declaring that they have solved nothing; Nesterov initially refuses to assist Leo’s private investigation but ultimately changes his mind and, over the following weeks, quietly travels to militia offices across the western Soviet Union, mapping murdered children. He finds 43 possible cases stretching from the Urals to Ukraine, concentrated around Rostov-on-Don, with Arkady added as child number 44. Meanwhile, the novel describes the murder of a boy named Petya from the killer’s perspective, revealing the murderer’s method—he lures children into forests, ties string to their ankles, and hunts them—and his identity: Andrei.

Leo and Raisa travel secretly to Moscow under forged papers to pursue leads but return empty-handed, having narrowly escaped capture by a friend of Raisa’s who turned out to be an informant and whom Leo killed. Back in Voualsk, Nesterov has been arrested by state security agents who discovered his case file. He manages to tip off Leo, but his escape ends in a car crash, and he is captured and taken to the Lubyanka. Under torture, Leo gives his name as Pavel, the boy from the Ukrainian village, and recalls the circumstances of his disappearance. He was carried away by Stepan, who intended to kill and cook him to save the life of his son. By the time he returned home, however, the boy had died of starvation, so Stepan and Anna adopted Pavel. Concussed and amnesiac, Pavel accepted a new identity and buried the trauma completely.

Leo and Raisa, who was also arrested in Voualsk, are loaded onto a Gulag transport train. Vasili arranges for criminal inmates to murder them, but Leo kills two attackers and rallies the other prisoners to his cause. He and Raisa ultimately manage to escape the train by prying up a floorboard and head south toward Rostov. A network of ordinary citizens passes them along a smuggling chain, each group choosing to help after hearing about the murdered children. During the journey, Raisa tells Leo that she has fallen in love with him and also reveals that the hollow coin held cyanide paste, not microfilm, a defense Raisa carried against rape during her years as a war refugee. In return, Leo explains that he has a brother.

In Rostov, Leo breaks into a tractor factory and examines the records of its tolkachs, supply agents whose jobs require travel between factory towns. One man’s travel records match every murder location and date. His name is Andrei Trofimovich Sidorov: Leo’s brother. Leo goes to Andrei’s home and descends to his basement, where Andrei sits surrounded by newspaper clippings of a photograph taken of Leo during WWII. Andrei explains that after Pavel vanished, their mother struggled to cope and abused her remaining son. He survived alone, was conscripted, captured by Germans, and returned to Russia branded a traitor. He began killing children as signals for Pavel, using the string snares and hunting methods Pavel had taught him, believing that his brother would eventually decode the pattern and find him.

Vasili arrives and forces Leo and Raisa, who has by this point entered the basement, to their knees. Andrei stabs Vasili through the back, saving his brother from being shot. Leo takes Vasili’s gun and aims at Andrei, who urges Leo to kill him. Raisa places her hand around Leo’s on the gun, and together, they pull the trigger. When Vasili’s officers arrive, they find evidence of Andrei’s crime and accept Leo’s claim that Vasili died attempting to apprehend the murderer.

In Moscow, Leo declines a promotion and instead requests permission to create Moscow’s first homicide department, with Nesterov as his partner. His records are wiped clean and his parents restored to proper housing. One week later, Leo and Raisa sit in the director’s office of an orphanage, waiting to meet Zoya and Elena, the daughters of Mikhail Zinoviev. The girls enter, gaunt after months of institutional neglect. Leo and Raisa offer them a home, promising safety and the freedom to accept or refuse. Left alone to decide, Zoya gives her little sister a hug.