Three workers die in a mysterious explosion accident deep down in a mine shaft. The incident is obscured, but rumors begin to spread about a find that no one can explain.

25-year-old Iiris and Karoliina have been best friends since childhood. Karoliina has been travelling and living abroad for some years now, but is coming back home for the summer as Karoliina has gotten them a job as waitresses in Hanko, the best summer city in Finland!