Young Merlin and his sister Ganieda discover a Round Table that holds secret star codes that can activate a template for the New Epoch. Before Gaea (Mother Earth) can be reborn, several riddles must be solved in different timelines that involve the druids of Mona, the Olympians, and King Arthur's court. A group of demi-gods must gather in 21st century London for the shift in ages to occur, but there is always resistance. There are curses to solve and people must work together for a special event in London to occur and no one knows the exact timing. Will Gaea survive? Riddles of the Ancestors is the fourth book and second novel in the Legends of the Grail Series, which can be read in any order.