ELDORA — An Ackley father has pleaded not guilty to allegations he kept his 8-year-old son in an enclosure under the steps of his basement home.Alex Craig Shadlow, 30, filed a written not guilty plea to charges of first-degree kidnapping and demanded a speedy trial. A trial date hasn’t been set.Shadlow’s fiancé, Traci Lynn Tyler, 39, entered a not guilty plea to the same charges earlier this month.