Cherie Priest 
Not Flesh Nor Feathers [EPUB ebook] 

When a devastating storm swells the Tennessee River to dam-breaking levels, panic rises. With then gushing waters came a tide of animated corpses: twenty-nine victims of a long-ago slaughter are patrolling the banks, dragging the living down to a muddy grave. No one remembers how they died, and no one knows what they want. Now reluctant medium Eden Moore must dredge up secrets about a long-buried crime that continues to be covered up, before the zombie army can add hundreds more to their ghastly ranks.