Ally loses her songbook, which is also her diary, so she and Trish desperately look for it, unaware that Austin and Dez have already found and read it, discovering that Ally has a secret crush. When Austin is convinced it is him, he tries to find a way to make Ally stop crushing on him and let her know they are just friends. Ally and Trish find out Austin and Dez have read the diary and plan an elaborate scheme for revenge to teach Austin a lesson. Ally reveals that her crush is actually a boy named Dallas (Noah Centineo), who works at the cell phone accessory cart near Sonic Boom, and the misunderstanding between her and Austin is cleared.
