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Sheldon and Leonard's apartment is robbed. Leonard takes the incident in stride, but Sheldon has an extreme reaction to his space being violated and his possessions stolen. As Leonard, Penny, Howard and Raj do whatever they can to help Sheldon overcome this new found fear of the apartment, Sheldon decides that he has to make some drastic changes in life to regain his sense of security. Meanwhile, Leonard, Penny, Howard and Raj learn that Sheldon considers them three of his closest friends and one treasured acquaintance, but no one knows who is the one that falls into that latter category.