It's summer on Gotland and a group of archaeology students are excavating an ancient Viking site. But the camaraderie of the group is shattered when one of their number, a Dutch student called Martina, disappears.
Rumours abound about a secret relationship with someone on the island, but is her disappearance simply a lover's intrigue? As Inspector Knutas begins his investigation, echoes from Gotland's Viking past begin to trouble his search.
When Martina's naked body is found with ritualistic markings on her skin, there can be little further question. Martina has been killed according to the Viking ritual of the three-fold death, and the one thing the ritual points to is that more deaths will follow...