Vacationing writer investigates mysterious fish deaths in Minnesota lake. Discovers former Nazi-turned-Communist group developing biological weapons at lab with Soviet funding. Teams up with... Read allVacationing writer investigates mysterious fish deaths in Minnesota lake. Discovers former Nazi-turned-Communist group developing biological weapons at lab with Soviet funding. Teams up with local doctor's sister to uncover their plan.Vacationing writer investigates mysterious fish deaths in Minnesota lake. Discovers former Nazi-turned-Communist group developing biological weapons at lab with Soviet funding. Teams up with local doctor's sister to uncover their plan.