Cristo's Chronicles is a prehistoric adventure series set in the early Bronze Age, focusing on two young boys, Cristo and Grigor, who become central to the development of early timekeeping and writing systems. As they navigate rivalry and treachery from Duke Nextor and his wizard, their courage and the knowledge they acquire allow them to count troops and relay vital information, impacting the outcome of conflicts. The story explores themes of innovation and collaboration as Cristo and Grigor teach their advancements to others while thwarting Nextor's plots.