4.0

Great for those coming to the topic from scratch. Johnsen draws together a variety of strands together to tell the history of Al-Qaeda in the Arabian Peninsula or AQAP, with a specific focus on its actions in Yemen.

I found the sourcing convention (no footnotes, but most things referenced at the back) a bit frustrating, but that's probably just me. For everyone else, this is an excellent (if dated by a few years, now) primer on religiously-inspired militancy in Yemen.