Finland 1944. A young girl named Tanya comes to work at a naval base, where dhe meets dashing submarine captain Alexander Marinin. Captain Marinin is the darling of fortune, nicknamed "the first after God", as every single one of his campaigns have led to victory over the enemy. Bur heavy storm clouds gather overhead, as the People's Commissariat of Internal Affairs sends the unscrupulous Major Sharabidze to the base...