Dinosaur Valley — K.H. Koehler

Digging Up Trouble . . . Lady Anna Rutherford, scholar and intrepid archaeologist, has crossed the Atlantic to launch an expedition into the Sonora Desert to find her missing twin brother, Edmond. But the unforgiving Sonora is only the beginning of their troubles, because soon enough, the search party encounters an ancient, forgotten valley full of primeval creatures with the power to rend grown men in half. Before long, their hunt for Edmond becomes a tooth-and-nail fight for survival when the ancient, man-eating creatures of the valley begin hunting them. It will take their combined knowledge, courage and survival skills if they are to escape Dinosaur Valley.