Javier Marías was born in Madrid. His father was the philosopher Julián Marías, who was briefly imprisoned and then banned from teaching for opposing Franco. Parts of his childhood were spent in the United States, where his father taught at various institutions, including Yale University and Wellesley College. His mother died when Javier was 26 years old. He was educated at the Colegio Estudio in Madrid.

Marías began writing in earnest at an early age. "The Life and Death of Marcelino Iturriaga", one of the short stories in While the Women are Sleeping (2010), was written when he was just 14. He wrote his first novel, Los dominios del lobo (The Dominions of the Wolf), at age 17, after running away to Paris.

Marías operates a small publishing house under the name of Reino de Redonda. He also writes a weekly column in El País. An English version of his column "La Zona Fantasma" is published in the monthly magazine The Believer.

Javier Marias' prize-winning novel follows the birth and death of a passion told in retrospect. A tenor known as 'the Lion of Naples' remembers a time when he travelled to Madrid to star in a production of Verdi's Otello. In the vibrant city his life is insular and routine, a daily cycle of rehearsals and hotel meals. That is, until he meets a strange trio and is incorporated into their group. Manur is a Flemish banker who employs a secretary, Dato, as a daily companion for his beautiful wife, Natalia. They begin to spend their days together, three inseparable friends, and yet as the friendship develops, Dato increasingly finds himself consumed by Natalia's unattainable beauty. And so passion and power frame this sophisticated, and at time perverse, comedy of manners.