This article offers a formal and careful reading of Yasmin Khadra's novel What the Day Owes the Night in light of cultural and post-colonial criticism. Methodologically, the study employs the imaginary at an important stage of the colonial context in Algeria, although it expands to include the various nations that lived under colonialism and were subjected to its tools of Westernization and exclusion, as can be observed nowadays in the Palestinian reality. The issue is both new and old at the same time, on the other hand, the text forces us to address the hidden aspects of the French milieu, which are neither completely innocent nor purely literary.