Somehow or other I've got behind with this series. Urgent catchup required.
From the Blurb:
In the fishing community of Fjällbacka, life is remote, peaceful - and for some, tragically short.
Foul play was always suspected in the disappearance twenty years ago of two young holidaymakers in the area. Now a young boy out playing has confirmed this grim truth. Their remains, discovered with those of a fresh victim, send the town into shock.