The Lighthouse Keeper

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. Anna Ihrén grew up in Stockholm and Gothenburg but spent her childhood summers on the island of Smögen.
Her series of crime novels "The Smögen Murders" has become very popular, "The Man on the Beach" being the first book in the series.