It's summer on Gotland & an international group of archaeology students are excavating an ancient Viking site. The camaraderie & holiday spirits of the group are shattered when one of their number a Dutch student called Martina disappears. Rumours abound about a secret relationship she was having with someone on the island but is her disappearance simply a lover's intrigue? When the body of a horse is discovered in a local farmer's field other rumours begin to circulate. The horse had been decapitated & the head has vanished. As Inspector Knutas begins his investigation echoes from Gotland's Viking past begin to trouble his search. When Martina's naked body is found hanging from a tree with what look like ritualistic markings on her skin there can be little further question. Someone is calling to the old Gods of Gotl&. Martina has been killed according to the Viking ritual of the three-fold death & the one thing the ritual points to is that more deaths will follow.