The diphtheria outbreak in Nome is spreading fast as a relay of dogsled teams races across Alaska, carrying the only available medicine. Leonard Seppala knows that if he and his lead dog Togo take a shortcut across the frozen Norton Sound, they can shave off precious time and make it to Nome faster. But Seppala also knows he risks getting blown out to sea or falling through a crack in the ice, losing his team and the precious medicine he’s carrying.  

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