The answer to this question can be found in the beginning parts of the chapter that is titled "Confession and Confusion." In the previous chapter, the children wrote a note to the Oracle of Thoth asking it where Security is. Security is Marshall's stuffed octopus animal. When the chapter begins, readers are told that Toby had trouble sleeping because of his conscience. "He thought and worried and thought" until he became so stressed that he called up April. He arranged to meet her and Melanie by the parallel bars during first recess. The ladies wandered over there at the designated time, and he confessed to them that he was the person writing the answers to the questions being presented to the oracle. He also confessed that he has no idea where Security is.

When April and Melanie wandered over—and registered exaggerated surprise to find him there—he got right to the point. “Look,” he said, “I was the one who wrote those answers. I was the oracle. But I don’t know where Marshall’s old octopus is. What’re we going to do?”

April and Melanie then question Toby quite a bit about how he was able to "steal a peak" at the questions, get the answers, and sneak out of his house.

When Toby and Ken join the Egypt game, things get more interesting, especially when they begin playing the Oracle of Thoth. They follow Toby's recommendation for how to play, which requires a person to submit a question to Thoth and wait overnight for the answer to appear. When the answers mysteriously appear written on the back of both Ken's and April's questions, the children begin to get spooked. Most of the children want to stop playing, but Toby insists the game is just starting to get exciting. Marshall insists they can't stop playing until he has a chance to ask the Oracle about his missing comfort toy, Security. The next day at school, Toby arranges to talk with April and Melanie on the playground. He confesses that he was the one who wrote the answers to Ken's and April's questions. He had looked up key words from each question in a book of familiar quotations. He sneaked out of his house at night, went to Egypt, and wrote the answers on the papers. He knows Marshall is expecting a real answer to his question. The three children plan to give an answer that will temporarily satisfy Marshall. When they get to Egypt, April finds that someone else has written an answer about the location of Security, an answer that turns out to reveal where the stuffed animal has gone. This mysterious turn of events puts a damper on the Egypt game for the children for a while.