I think Eddie was cheating becasue all eggs need to be not boiled but Eddie was doing with boiled egg and it made him easier. But I found a clue in Mr. O'Hara's
sentence: I'd better sweep up the mess...
If I was Kitty, I should think of Encyclopedia Brown with Kitty's plan because he can solve every case with little clues. Kitty should have think she had worn soft slippers so she can be the theif. S...