Rise of the Demigod

Camp Half-Blood is under siege.

A horde of monsters straight from the pits of Tartarus is out for the blood of Demigods. After hours of fighting, Chiron consults the Oracle on what to do next. She tells him a prophecy of sixteen Demigods who will plunge into the pits of Tartarus and bring back the one thing that can save the camp -- The Amulet of Tyche. The holder of this amulet is said to have enough good fortune to turn the tide in wars.

Unfortunately, she tells Chiron that only one brave hero will come back from this dangerous quest. Arm yourself with weapons and wits because you'll need both if you're to be the one to survive.