You are the Stranger, you have come across a mysterious book known as Myst, you read a description of a far away island, at the end of the book you see a picture of the island described in the book, then you end up on the island, you find out that the island was the former home to Atrus and his two sons, who are stuck in two books in the library on the island who each ask the same thing of you, bring them red or blue pages. You then read about other worlds known as ages, and solve various puzzles to travel to those ages, and try and find a way off the island.
—CastleintheMyst99