'Someone is imprisoned in a horrible cage, but why is Jack trying to get caught by Ranger Johnny Wolf? What is Foxie up to? And just who is sharing Jack's basket these days?
'Everything is fine in Doggeroo until Sarge falls ill. Auntie Tidge is at hand to look after Jack, but Foxie is being disagreeable (again). When will Sarge be back?
'In no time, Jack has both a case and a moral dilemma-- or even two. Is it right to leave his most dangerous enemy trussed up in a cage? And, who will mind the boy while he's off detecting?' (Publication summary)