I just got hit with a wonderful idea for my current novel that literally solves everything regarding revealing fine details about my villain to both the reader and one of my MCs. But the idea slightly concerns me and so I'm asking for opinions on it. In my story, I want my female MC to discover a (fairly old) diary that was written by the late wife of my villain. The diary would reveal to her (and the reader) things about the villain that I would not logically be able to reveal otherwise and also tell her things about the villain's late wife (who's just as equally important). The great idea I had to reveal such details was to have a chapter transition. One chapter would end where my female MC is getting ready to read some of the diary and the next chapter would be the events of whatever entry she was reading written in the way the rest of the novel would be written (through the eyes of the late wife, though, so I'd be going from 3rd person to first person, or I could always leave it in third person...). My concern is: Is this a good idea? Is it better for me to go with this idea or to just have my female MC regularly reading the entries and not be actively putting the reader into the situation of the entries?