最鬧的企鵝 Peng 和最愛說話的貓 Spanners 又接到新任務！一座知名莊園疑似遭到可怕的沼澤怪物入侵，而且這隻怪物似乎特別喜歡綁架乳牛。兩位超級英雄受命調查，卻還是老樣子：花在聊天、爭論和找披薩上的時間，可能比真正拯救世界還多。
幸好機器狗 Secret Business 比較可靠，牠搭上迷你潛水艇深入沼澤，偷聽可疑人物的對話；Peng 和 Spanners 則負責訪問嫌疑犯，追查怪物背後的祕密。放射性冰淇淋、泥沼怪物、失蹤乳牛與一群可疑人物接連登場，本書以快節奏漫畫和大量無厘頭對話展開調查，推薦給喜歡 Dog Man 式動作喜劇的孩子。
The silliest penguin and the chattiest cat are back to investigate the cow- eating swamp thing in this action-packed graphic novel for fans of Dog Man!
Welcome to a story of radioactive ice cream, monsters in the sludge, and two superheroes who spend more time chatting than actually saving the world . . .
When everyone''s favourite stately home becomes haunted by a terrible swamp monster (who seems to love kidnapping cows), Peng and Spanners are called in to investigate the swamp and unblock the mystery. Luckily the robot dog Secret Business is prepared to hang out in a miniature submarine and snoop on suspicious conversations between anyone who has an interest in causing mischief. Meanwhile Peng and Spanners interview suspects, debate everything, and try to get their hands on more pizza . . .
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