Twelve-year-old Crow has lived her entire life on a tiny, isolated piece of the starkly beautiful Elizabeth Islands in Massachusetts. Abandoned and set adrift in a small boat when she was just hours old, Crow's only companions are Osh, the man who rescued and raised her, and Miss Maggie, their fierce and affectionate neighbor across the sandbar. Crow has always been curious about the world around her, but it isn't until the night a mysterious fire...

When the massive metal tank filled with sticky brown molasses that rises up over her crowded North End neighborhood explodes, young Carmen must fight for her life, as a tsunami of molasses rushes through the streets.