14. The one or more non-transitory computer-readable storage media of claim 10 , wherein the story is associated with an electronic book and the text string is associated with a passage or chapter of the electronic book.
10. One or more non-transitory computer-readable storage media collectively storing computer-executable instructions that, when executed by one or more computer systems, configure the one or more computer systems to collectively perform operations comprising: determining at least a portion of a text string associated with a story; determining a linguistic element in the text string; analyzing the linguistic element in the text string with respect to a story complexity that comprises an identification of a linear or non-linear story flow, wherein analyzing the story complexity further comprises: determining a character in the story; determining a number of other characters that interact with the character; and identifying a greater story complexity when the number of other characters associated with the character exceeds a character threshold; and determining a maturity level associated with the portion of the text string based on the analysis.