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Amy's encounter with dinosaurs and cave dwellers-and aliens-was pretty wild. Now her quest to stop the spread of the infectious bacteria gets even more bizarre as she agrees to take another perilous voyage.

A voyage inside a plague-ridden human body.

If Amy survives being injected into this complex landscape where good cells are waging battle against bad cells, she could save millions of lives. But it's a do-or-die world in there. . . .