 Mrs. Brown gets zapped by Martin s personality altercator. There doesn t seem to be any outward effect from the blast, however this façade is part of her personality change. She has absorbed all the contents of Tim s book, The Criminal Mind, and solely has theft on the brain. She shoplifts some small items, not too much of an issue since Martin and Tim plan on taking them all back. But some information Det. Brennan passes along to her regarding his security of the Slotkin Diamond makes her think of the bigger catch. However before she can steal it, someone beats her to the punch. Martin and Tim, and by snooping, Mrs. Brown find out the real thief is the security guard hired to transport the diamond, Jack Plummer. Now all Martin and Tim have to do is beat Mrs. Brown to Jack and the diamond and lead Det. Brennan to the thief without implicating either themselves or Mrs. Brown. And of course, they have to give Mrs. Brown an antidote to cure her of her thieving ways.