Buried amongst the treasures in Professor Brownstone's vault, lie his most prized possessions - a humble collection of books. Filled with stories from his ancestors, they contain tales of fearless fighters, unlikely heroes and legends from years gone by.

Get ready to meet Luna Brownstone: the most devious Brownstone of all. When a tragedy strikes her family, she decides that she will only ever look out for herself. She runs away, and begins her search for riches to steal. Whilst travelling, she stumbles across a village ravaged by drought and hears rumours of a palace filled with great gold treasures. When a young girl, Atzi, volunteers to journey to the palace of the rain god Tlaloc with an offering to save her village, Luna develops a cunning plan: befriend Atzi, steal her map, and find the god herself.

Working together to find the palace Atzi finds herself in danger; Luna needs to decide what matters most.