Spending the summer in Maine with her grandfather, fourteen-year-old India Finch is still exploring her new healing powers as one of the merpeople, and still trying deal with the conflicts between the two Mer tribes--so when she and her friends find out that the Fire tribe is searching for a powerful weapon called Neptune's trident which they will use against humans, they decide that they had better find it first.

For young Cora Moffat March 18, 1925 has been a bad day, but it gets much worse when her school is hit by the Tri-State Tornado, and she, her twin brother and her former best friend Claire, struggle to survive as the school and town are destroyed around them. Includes historical notes.