@bapsi I really enjoyed it.
It is a wide-ranging general discussion of diaries. The author writes about what is a diary, how they can be useful, how they have been used in the past, why we read other’s diaries, things to consider when donating your diary. There is even a chapter discussing why some people destroyed their old diaries.
Lots of references to diaries I still need to look up and read, as well as some academic references I’d like to read.