Roberto della Griva, a 17th-century Italian
nobleman, is the sole survivor of a
shipwreck during a fierce storm. He finds himself washed up on an abandoned ship, the
Daphne, anchored off a mysterious Pacific island through which, he convinces himself, runs the
International Date Line (roughly 180°
longitude). The ship is fully provisioned, he discovers, but the crew is missing. Although the shore is very close, Roberto is unable to swim, and is therefore stranded on the ship. With no way of locating himself or finding a way home, Roberto abandons himself to philosophical contemplation, roaming the crewless ship and composing letters to his beloved Lilia, a lady he met in
Paris some time prior to his misadventure on the high seas. Roberto soon discovers he is not alone on the ship. Someone else is stealing eggs from the hens, rummaging through the letters he writes to Lilia: in short, there is an Intruder aboard. Finally Roberto finds out the intruder: an old German
Jesuit called Gaspar Wanderdrossel. Wanderdrossel relates to him the mission of the
Daphne's crew and the crew's sad ending at the hands of the
natives. Gaspar explains to Roberto that his mission was to discover how to measure longitude by charting the
eclipses of the
moons of Jupiter. He also educates Roberto to other recondite astronomical means being used to seek this measure. The priest comes to take on a
mentor role with Roberto. He urges Roberto to learn to swim. Roberto tries and tries again, but fails. Gaspar finds his own way to reach the Island, and Roberto is left alone again. He begins to reminisce about his life and his love. He becomes obsessed about his allegedly evil twin brother, who is split from his own persona through a process reminiscent of the
doppelgänger effect, and thus accusing him of all the bad things that happened in his life. The brother takes blame mainly for his bad choices and is present to sweeten the disappointments of life. Through this reminiscence he becomes convinced that all his troubles will end, if only he can reach the land. The story is told from the point of view of a modern editor who has sorted through the man's papers. Exactly how the papers were preserved and eventually handed down to the editor remains a point of conjecture. This work contains references to Eco's previous novels. In one example, there is a mention of a crucial plot point from Eco's first novel
The Name of the Rose. The novel presupposes a “model reader” who possesses a certain specialist encyclopedic competence, in particular with regard to the
aesthetics of
Mannerism and the
Baroque, although it in no way excludes a more average reading public. A number of characters have been borrowed from historical reality, such as
Cardinal Richelieu,
Cardinal Mazarin, and
Colbert. Many fictional characters owe their names and their ideas to known cultural personalities of the Baroque period, such as Saint-Savin (
Savinien de Cyrano de Bergerac), Father Emanuele (
Emanuele Tesauro), and Father Gaspar (
Gaspar Schott and
Athanasius Kircher). == Critical reception ==