The work of the author is admirable, however, it is in serious need of a strong editor.
There are spelling, syntax, or grammatical errors on nearly every page, including inconsistent spelling of people's names. The book reads more as a series of articles about this case, with many facts repeated in multiple chapters.
The "sources" are all articles written by the author.
I appreciated the sections on how the province and RCMP are tackling gang activity and the chapter about how folks can get support to leave a gang.