Vanger promises to provide Blomkvist with evidence against Wennerström in return for discovering what happened to Vanger 's grandniece, Harriet, who disappeared in 1966; Vanger believes she was murdered by a member of the family. Harriet disappeared during a family gathering at the Vanger estate on Hedeby Island, when the island was temporarily cut off from the mainland by a traffic accident on the bridge.
where does girl with the dragon tattoo take place
Hedeby Island