Eco's third novel is similar to both The Name of the Rose and Foucault's Pendulum in its expansive range of subject matter and its consummate erudition. Roberto, a young Italian nobleman, is shipwrecked while spying on a 17th-century mission to discover the elusive scerets of longitude. He drifts to an abandoned ship, the Daphne, which is anchored on the date meridian in the Pacific, just off the coast of 'The Island of the Day Before'. Here he recounts the formative experiences of his life, from the siege of Casale to his fateful meeting with Mazarin and Colbert in Paris. An amazing historical tale which also considers philosophy, horology, cosmology, theology and identity along the way. (Kirkus UK)