Sergei Lukyanenko’s works.

Initially, they wanted to shorten the plot to fit it into the limited film time, but this required restructuring it. Yegor being Anton's son is nonsensical. It's clear that the subsequent "Day Watch" was already some kind of plot-driven trash. Lukyanenko sacrificed his self-respect, allowing them to make something awful out of his book, but he received a substantial sum in return.