Now you help me."As fourteen-year-old Allison Blair lies comatose in the hospital, she hears in her head the voice of Becky Lee Thompson, pleading for help and pulling Allison back in time to 1906—and into Becky's body. But why? Is it to prevent Becky's tragic death, or the death of Joshua, the boy who loves her? Allison must remain in the past—fortified by her own growing feeling for Joshua, and Becky's will—to make sense of the layers of mystery, blackmail, and mistaken identity so that history will be altered.Becky's spirit struggles to keep Allison's body alive. Can Allison save Becky and Joshua and return to her own body before time runs out?

    A team of teen scientists... A desperate fight to survive.... In book 2 of Dawn of Mammals, Hannah and the kids are swept back to the Paleocene, where giant avian dinosaurs still reign as the apex predators. In a jungle world of sweltering heat, the time travelers must learn new skills to survive the swamp creatures and the dreaded Terror Crane, a half-ton bird that could snatch any one of them up with its deadly beak.

    Trying to survive from day to day in a world of dinosaurs he devises a plan to change his fate. As he begins to write messages in the soft mud of a nearby stream, he can only hope they will be found by someone who can stop his time travel. Professor Ron Fontana and Professor Ray Taggit, scientists with opposing views, each discover the fossilized messages. While attempting to save Charles, Professor Fontana, his daughter Lauren and their friend Danny are forced to join Taggit and his group of mercenaries. Taggit does not intend to rescue Charles Dawson, but to force Dawson to travel back in time to gather samples for Taggit's fame and fortune. As the two groups jump through time they find they must work together to make it back alive as this fast-paced thriller climaxes at the very moment the age of dinosaurs is ending.