This is book number 3 in the Detective Gordon series.
Gordon is on vacation, and Buffy is the sole detective at the small police station in the forest. It is not easy for a police officer to be alone. Especially when there are strange noises outside the station at night. Buffy decides to seek out Gordon in his little cottage by the lake to ask for help. After all, two police think twice as well as one. Two police are twice as brave