The Gate of Days is by Guillaume Prevost. The second book in the Book of Time series. Sam is still trying to rescue his father from Dracula's castle. On his search for more coins for the machine he accidentally drags his cousin along with him. After escaping prehistoric hunters, the eruption of Vesuvius, and ancient Greeks, Sam and Lily must find their way back to their own time after meeting their great grandparents in 1930s Chicago. Will they get home? Will Sam be able to save his father from the clutches of Vlad Tepes?
Ratings: 6th grade - 7 out of 10.