Find the timesheet and get the money from Stanley.
at the main menu of the game you will see something called the book of secrets.your supposed to beat the game to unlock it but heres an easier way to get it. go outside aprils room and look at the plant.pick a leaf from it. much later in the game when your at abnaxus's house you should see two red flowers too the left of the screen. take out the fake leaf and put it near those flowers and then a flower will grow. then you should have unlocked the book of secrets!