Darkness descends over Sotenäs... When the daughter of an American ambassador is found lifeless in the famous marble pool on the small island of Hållö, the case lands on Sandra Haraldsson and Dennis Wilhelmson's desks. Garnering enormous attention from the public, not least from the White House, the duo is soon led to an old lighthouse on Hållö: a lighthouse with plentiful of secrets... "The Lighthouse Keeper" is the fourth book in "The Smögen Murders" series.