Watch 711-s05-e015-tbbt (iPad TOP)

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: Leonard writes a murder mystery novel featuring a character named "Ilsa," who is a thinly veiled, unflattering version of someone in his life.

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: Penny initially believes the character is based on her, leading to tension. However, it is eventually revealed that the cold and domineering character is actually based on Leonard's mother, Beverly Hofstadter.

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While your query mentions "S05," Season 5, Episode 15 is actually titled . In that episode: : Available for purchase or rent by episode or season

Sheldon's "Roommate Agreement" is suspended after Leonard gets tired of Sheldon’s demanding nature.