Agatha Christie, one of the world famous Mystery novel writer, dedicated her life to literature and referred as Master of Suspense’s and Twist’s. This study mainly depicts the nature and sweetness of the mathematical logic in the field of literature, and also reveals the true nature, meticulous style of Agatha Christie’s novels. The purpose of this paper is to study how Mathematics can be applied in the world of creative literature, and how ‘mathematical’ logic plays a vital role in solving mysteries. This paper carries several research works which includes the classification of Classical logics; Fuzzy logics; examining the nuances and main suspect behind the murder. I strengthened this study by interlinking both Mathe-matics and literature. Also this paper discusses the nature of murder mystery novels and also narrates how the suspense’s plays a vital role in Agatha’s novels. Theoretical fuzzy Logic explanation and practical logic application for solving these mysteries are explained with particular case studies.