If you talk about a chapter of accidents, you mean a series of unlucky events. Luckily for him, few people were witness to this chapter of accidents. In fiction, however, such a chapter of accidents can end up seeming comic. Note: This expression has been used many times by various writers. One of the earliest uses is `the chapter of accidents is the longest chapter in the book', the book being the story of a person's life or a record of a particular event.