"Anna Kellogg has always felt different. Growing up in Hartwood, New Jersey--where frequent disappearances are attributed to an urban-legend-like beast that dwells in the walled-in swamp at the center of town--can have that effect on people. But for Anna, it's more than that. Since she was a child, she's been plagued by episodes where she sees things others can't see. Feeling different is one thing, but actually being different is another. If it weren't...