Aron (14) loses his mother to the Spanish flu. He canít share his grief with his father, a rational scientist. He can with Lena, though, a Flemish girl who is hiding out in the nearby swamp, who has fled the horrors of WWI. They fall in love. Because Lena turns out to have immunity to the Spanish flu, the frightened, riotous people in Aronís village see in her the Witch of the Fens. Aron will have to overcome his greatest fears in order to protect and save his beloved.