This is the 7th book in the Colony Ship Eschaton series.
Jamie and Michael are asked to help track down something that is destroying food in Habitat One of the Colony Ship Eschaton. What they find is a secret history of the ship itself. Cut off from everyone, except their dog, Liduma, Jamie and Michael race to find all the pieces of this suppressed history. But something else is seeking it as well and does not want Jamie and Michael to succeed. Will they make it back to report what they have learned about the building of the colony ship?