Underneath the Moon 4 — Dan Holt

The giants' missing ships, with 200 Elders from Mars and the Moon, have been found! Mentar will return from Zannia to take them home...along with one last artifact they retrieved from a hidden vault on the Moon. As Earth's little ones journey with them, on a colony exchange, the artifact will activate, leading to unexplained encounters, beckoning them to look beyond Earth and Zannia, deeper into the Galaxy.