باب: هل للأسير أن يقتل ويخدع الذين أسروه حتى ينجو من الكفرة فيه المسور عن النبي صلى الله عليه وسلم

This chapter is a heading with no hadith beneath it in this copy. That is part of how the book is built, not a gap in it: Bukhari sometimes titles a chapter and places its hadith under the next one, or leaves the heading as an inference. Seventeen chapters in the collection are like this.

References and details are on the sources page.