MaryAnn Hu

Elizabeth takes on an unexpected position of power when the president's plane is declared missing; Henry's new handler asks him to recruit one of his students for the NSA.

Kevin interrupts Jackie and Frank's night. Akalitus' blood results are in and her memory loss is a result of a medication she's been taking. Zoey helps Prentiss organize his disaster of an office. Meanwhile, Jackie is convinced that Grace is sneaking behind her back to see Danny, but Grace assures her they broke up. Frank urges Jackie to work on her issues - so she attends an AA meeting.

Sherlock and Joan search for a murderer who used poisonous mushrooms to kill a botany professor and a group of the instructor's students. Also, when Joan is disturbed by loud noise next door, she discovers her neighbor, Trent (Richard Kind), is renting out his home through a vacation site that caters to hard pratiers.