I is for Illusion

The girls go on a vacation with Irma's family. They are having a rough time adjusting to living in a cramped space, but they manage to cope until the girls begin acting negatively to one another. At one point they get into a potentially dangerous situation, and the result ensues in an all out argument. The Oracle then appears to them, asking to claim back the Heart because of distrust and absence of harmony amongst the girls. Only Hay Lin sees the shadow of Nerissa cast by the Oracle, and the girls know there is something wrong. A battle ensues, and Caleb and Blunk return from Meridian in time to help out and victory goes to the Guardians. The girls then apologize to one another and stop arguing. In a subplot, Caleb and Blunk are fighting against the other Knights of Vengeance.