Inspector Kollerup wins a vacation to an island known as a hallig, where he has nothing to do. There he meets an unlikely friend, turned assistant detective. When the local mudflat tour guide winds up dead, Kollerup suddenly finds he has something to do with his time.

Inspector Kollerup wins a vacation to an island known as a hallig, where he has nothing to do. There he meets an unlikely friend, turned assistant detective. When the local mudflat tour guide winds up dead, Kollerup suddenly finds he has something to do with his time.