In his time living in the peaceful village of Frog’s End, the Colonel has learned that although the place looks as lively as a stagnant pond, there is plenty going on. When he receives a letter from an old friend of his late wife, telling him that ‘something horrible has happened’ and asking for his help, he is intrigued and happy to assist her. But when he travels up to see Cornelia, he is shocked by what he uncovers, and soon realizes that he must take the investigation into his own hands