After rowing out to an island near their seaside home, Tulsi and Satchen discover a whale that has been trapped in a fishing net. Determined to try to free the poor creature, they repeatedly dive down into the freezing sea to cut the netting, but eventually, exhausted and with a storm rolling in, they have to admit defeat.

As they head for home to seek help, their boat capsizes in the storm and they're left clinging to it, dangerously adrift. Just as they think all is lost, help arrives from an unexpected source ...