A decade after his heroic defeat of the monstrous Kraken, Perseus-the demigod son of Zeus-is attempting to live a quieter life as a village fisherman and the sole parent to his 10-year old son, Helius. Meanwhile, a struggle for supremacy rages between the gods and the Titans. Dangerously weakened by humanity's lack of devotion, the gods are losing control of the imprisoned Titans and their ferocious leader, Kronos, father of the long-ruling brothers Zeus, Hades and Poseidon.

Follows a young man named Albert and his horse, Joey, and how their bond is broken when Joey is sold to the cavalry and sent to the trenches of World War One. Despite being too young to enlist, Albert heads to France to save his friend.