What does mildred find under montags pillow?
Montag comes home sick after work one night after watching a woman commit suicide by striking and match and lighting herself and her home on fire. He is sick from the notion that he watched a woman kill herself. While in the woman's house with the other firefighters, he steals a book from her home. When he arrives home after work, he hides the book underneath the pillow.
Later that day, Captain Beatty comes to visit. As he is speaking with Montage, Mildred tries to straighten up the house and his pillows and finds a book underneath his pillow. She is shocked at what Montag has, done but does not do anything about it.