This paper is an attempt to show how readers' underlying network of prototypical schematic expectations might be activated at different levels to address schematic/ cognitive challenges. When these levels of detail are activated, a cognitive defamiliarization process occurs as a result of schematic deviation. With varying degrees of under-/over- specification, this sort of cognitive deviation raises up certain levels of schematic instantiation. Consequently, a schematic challenge might merely require the reader to retrieve unexpected levels of information from their already-existing schematic toolbox rather than changing or bringing in new schemata. 'Inferno', that of Dante Alighieri and that of Dan Brown, presents this cognitive challenge to readers' schematic knowledge in a way that is inextricably linked to the fundamental creative elements of the fantasy fiction genre which both works belong to. However, the Schematic Knowledge Deviation (SKD) that occurred in both novels is stated by triggering the most well-known and accessible levels of the standard elements in a schematic specification. This has been proven and demonstrated using Cmap Tools, which intuitively depict the most typical and markedly exhaustive levels of detail or pathways generated by readers. SKD, hence, has its own side effects on the linguistic level and has been measured linguistically via WordSmith Tools, specifically via the TTRs counted for the textual samples this paper deals with.