In pre-World War II London, a young Polish violin prodigy named Dovidl, is taken in by a British family, the Simmonds, to study music and escape the looming conflict. Martin Simmonds, the adoptive family's son, and Dovidl develop a deep friendship through their shared love of music. On the night of Dovidl's highly anticipated debut concert, he mysteriously disappears without a trace, leaving Martin and his family devastated. Decades later, Martin, now an adult, is haunted by the mystery of Dovidl's disappearance and sets out on a journey across multiple countries to uncover the truth about what happened to his friend.

As Martin delves deeper into the past, piecing together clues from their shared history and encounters with various individuals who might have known Dovidl, he uncovers layers of secrets that reveal the profound impact of war, faith, and music on their lives. His search becomes not just an attempt to find Dovidl but also a reflection on his own identity and reconciliation with the past. Ultimately, Martin's quest is a poignant exploration of friendship, memory, and the enduring legacy of those who disappear.