Penny Nichols and the Knob Hill Mystery

Christopher Nichols travels to Knob Hill for a much-needed vacation. Penny unenthusiastically accompanies him, expecting a boring vacation in their secluded destination. The vacation proves to be far from boring.First, there is the strange man who asks for a ride and then suddenly disappears. Next, old Herman Crocker appears to be imprisoning and abusing his grandson. The housekeeper, Mrs. Masterbrook, is caught snooping in Mr. Nichols' belongings, and a young man arrives at Knob Hill claiming to be looking for old Mr. Crocker, yet is unwilling to go see him.