Never a dull moment for Sandra Blackwell and Elaine Franks. Landslide continues their adventures with the unknown. Professor Riggs and his team of grad students return from a dig in Peru. They aren't alone. What came back with them? Only Old Man Downing knows the truth and he's not talking.Riggs and his team join up with Sandra and Elaine to battle this latest development in the college city of Lincoln, NE. Will it result in disaster or can they prevent...