Carrie, Rose, Oscar and Frank discover that a memory wipe they performed on Mrs King is about to fail, when she starts to be convinced she is a spy. Frank gives the agents a new mission: monitor Mrs King because if the memory wipe fails, they will be finished in MI9. Oscar comes up with a plan to trick Mrs King into believing that St. Hope's is an MI9 training facility and that all the students are spies. Mrs King meets a supposed SKUL agent, who turns out really is working for SKUL! The agents are not convinced but are eventually proved wrong. Oscar's plan succeeds and by the time Mrs King's memory wipe fails, they have set everything up to make it appear that it was just a dream. (thetvdb.com)