This dissertation seeks to critically investigate Martin Amis’ Night Train and London Fields in terms of Jacques Derrida’s concepts of deconstruction, supplement, and undecidability. Deconstructing Night Train as a novel which presents two categories of masculine and feminine, the text determines two recognizable sets of identities of which the feminine is marginalized. However, the one-to-one relationship of the marginalizing process demonstrates différance, i. e., the marginalized loses the difference which posits it in the secondary locus of the supplement. As a result of the constantly alternating position of the supplement there emerges the free-play of marginalization in the feminine/masculine binary which is closely in correspondence with the homicide/suicide binary. Considering that the novel explores the feminine suicide and the underlying motives, the text seeks to privilege the nature of a silenced act, the unprivileged feminine suicide. However, the problem of différance and the interchangeable locus of the marginalized result in undecidability and a democratic voice of both feminine and masculine together with homicide and suicide as two equal acts; therefore, the attribution of suicide to women does not p[rove that women are marginal and infirm. Furthermore, the phallogocentrism in question is deconstructible due to the problem of transcendality, différance, the interchangeable locus of the supplement, and undecidability.