What are the motifs in When We Were Orphans by Kazuo Ishiguro?

Disillusionment is a recurring idea in the narrative. Even years after his parents' disappearance and his departure from Shanghai, Christopher has maintained in his mind a mythological Eden of his childhood. In this fairy tale world, his parents are noble; his friend is his eternal ally against the kidnappers; the detectives are the finest in the world; and Shanghai is beautiful. Despite his success and fame he has gained in London as a detective, he continues to believe that the Eden is still waiting for him; if he can find his parents. He also starts to believe that the world is dependent on him to solve this case and that somehow, all the turmoil around the world is caused by the evil lurking behind his parents kidnapping. Therefore, he had a social obligation to solve this mystery as soon as possible.