Finally acting on Cedric's tip, Harry takes the egg to the prefects' bathroom by night, where with help from Moaning Myrtle he listens to the egg underwater. There, the shrieks become the words of a song, which tells Harry that the task is to recover something dear to him from Merpeople at the bottom of the lake in the grounds. While sneaking back to Gryffindor Tower under his invisibility cloak, he sees Barty Crouch in Snape's office on the Marauder's Map, despite Crouch supposedly being too ill to judge the Triwizard Tournament. While investigating, Harry falls into a trick step and drops the egg, which shrieks loudly and attracts Filch, Snape (who has had potion ingredients stolen), and Moody. Moody's magical eye sees Harry stuck in the stair under his cloak, but Moody covers for him, then borrows the Marauder's Map.