Deeper is by Roderick Gordon & Brian Williams. The second book in the Tunnels series. Will, Chester, and Cal continue their search for Will's father. The Styx recruit Cal & Will's mother, Sarah, to help them track down her sons, who they have accused of killing her brother Tam. The boys find friends in their search, but put those friends in danger for helping them. Meanwhile, Will's father continues to search for the answers to the mysteries of this strange new world. Another action-packed installment. Boys, especially, will enjoy this series.
Ratings: 8th grade - 9 out of 10 - V (some science fiction violence).