What is the conflict in the book Many Waters?

The major conflict in Many Waters is the fact that Sandy and Dennys Murry have been transported back to Biblical times (before the great flood) after interfering with their father's computer. Mr. Murry is an astrophysicist who studies space and time, so when Dennys types "take me someplace warm" into the computer, it transports them through time, and the twins find themselves in an unknown desert. The boys are burned badly by the sun and do not know where they have been transported. Throughout the book, the fact that the twins are in another time, away from their family, and unsure of how to go back is a major conflict, as they desire to return home even after adapting to the location and developing relationships with other characters.