When 16-year-old Disa is given five bitcoin by her divorced father she is unimpressed. But a year later, when her grandparents are about to lose their farm near the Icelandic village of Dalvik, quiet, unassuming Disa is able to rescue it with the profits from her astute trading of her father's gift. Unknown to Dasa, her mother Helga catches the cryptocurrency bug. Not only does Helga invest in Thomocoin, a new cryptocurrency sweeping Iceland, but she persuades many of her neighbours in Dalvik to invest too, taking a cut for herself. Helga is found murdered on the hillside above the farm and Inspector Magnus Jonson investigates. Magnus realises that Disa, now a 19-year-old student, can help him unveil the shadowy forces behind Thomocoin. But torn between loyalty to her family and fear for her life, Disa has other ideas.