While spiriting two new half-bloods off to safety, Percy, along with his powerful demigod allies, his best friend Grover, and his trusty bronze sword, must rescue the goddess Artemis when she mysteriously vanishes while hunting a monster rumored to be powerful enough to destroy Olympus.

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Rick Riordan
Richard Russell Riordan Jr. is an American author. He is known for writing the Percy Jackson & the Olympians series, about a twelve-year-old Percy Jackson who discovers he is a son of Greek God Poseidon. 20th Century Fox has adapted the first two books of his Percy Jackson series as part of a series of films. His books have spawned related media, such as graphic novels and short story collections. He conceived the idea for the Percy Jackson series as bedtime stories about ancient Greek heroes for his son Haley. Haley had been diagnosed with ADHD and dyslexia, inspiring Riordan to make the titular protagonist ADHD and dyslexic. Prior to Percy Jackson, Riordan had written the Tres Navarres series, a series of mystery novels for adult readers.