The Porpoise is a novel by Mark Haddon. Most of the novel is a retelling of the play Pericles, prince of Tyre, which follows the travels and misfortunes of a fictitious prince (not to be confused with the Greek historical figure Pericles). The novel also follows a modern-day storyline in which a man named Philippe tries to cover up the secret that he has frequently raped his daughter Angelica for years. The modern-day storyline bears some tangential parallels to the Pericles storyline. The novel explores themes of adversity, adaptation, fortune, spirituality, and responsibility.