Steve's lie about liking to break codes comes back to haunt him when Quinn gives him a message to decode, and he must either figure out the code or tell Quinn the truth.
Lin and Kris are competing for the best grade on their science papers, but as the due date draws near, Lin suspects foul play when her chief resource, a library book, suddenly disappears.
Jen is uncomfortable when her best friend Fran tries to make life tough for the new girl on the track team, and her actions force Jen to make a tough decision about their friendship.
Dave has always hated math, but when his low grade threatens his place on the wrestling team, he must find a way to improve his grade before the big meet on Saturday.