Sergiy Efron, an outstanding figure in Russian literature. He managed to be an officer of the White Army, an NKVD agent, and a publicist. Efron was the husband of Marina Tsvetaeva, one of the most famous poets of the Silver Age. Even Tsvetaeva herself could not precisely define who her husband was, a spy or a literator.

Efros was born in the autumn of 1893. His parents were revolutionaries, and their activities occupied all their free time. Sergey rarely communicated with his parents and often lived with relatives. Despite this, he grew up to be a kind and sensitive child, showing an interest in literature and art from an early age.

In his youth, Sergey lost his mother, father, and brother. He did not learn of the tragedy immediately, as his sisters tried to shield him from the terrible news, fearing for his health; he had suffered from tuberculosis in childhood, and the illness sometimes reminded him of itself.

Sad news eventually reached Efros, and he struggled to cope with the loss. Since then, he feared parting with loved ones, panicking if he did not see someone from his family or friends for a long time. Despite the difficulties, he graduated from a private gymnasium in Moscow and enrolled in the historical and philological faculty of Moscow State University.

He met his future wife while vacationing in Koktebel, at the house of his uncle Maximilian Voloshin. He was 17 years old, and Marina Tsvetaeva was 18. She immediately felt that her fate was tied to this young man. Eight months later, they got married, and on the day they met, Sergey gave Marina a carnelian bead, which she kept for her entire life.

In the autumn of that same year, their daughter Ariadne was born. A year later, a tragedy occurred in Efros's personal life; Tsvetaeva cheated on him with his older brother, Peter.

After World War I, Efros settled in Constantinople. It was not until 1921 that Marina received a letter from him, and in the spring of 1922, the family reunited in Berlin.

Soon they had a son, Georgy. There were rumors that his biological father was the family friend Konstantin Rodzevich. These rumors nearly led to a divorce, but Marina begged Sergey to stay. She could not imagine life without him, and he relented. Efros was unsure about the correctness of his decision, so the family moved to Paris.

In exile, Sergey missed Russia. Marina noticed his depressed state, and conversations about returning home became more frequent. In 1937, he returned to Leningrad, and Marina joined him two years later. Upon returning, Tsvetaeva was shocked; Sergey was seriously ill, suffering from the separation from his family.

Despite a difficult life, Efros left a significant literary legacy. His work "Childhood," a sincere and heartfelt gift to his wife on their wedding day, was published in 1912. The next important work was the book "Notes of a Volunteer," which included essays and stories, including the article "Emigration."

Efros wrote in collaboration with Tsvetaeva, and their love became part of Russian literature. Their joint works, letters, and poems are collected in the anthology "There is no second Vas on earth," reflecting the history of their personal and creative relationships, including marital infidelities and forced separations.