A fantasy novel very loosely based on An Shi rebellion. It is pretty well-researched IMO & the author was able to quote a few classical Chinese poems and stuff, & conveyed a sense of cosmopolitanism as well as brutality of that period. The first 3/4 is sort of slow IMHO & the protagonist Shen Tai doesn't seem to be a very interesting comparing w/ several supporting characters. Maybe I'm biased b/c I've seen lots of stuff written or set in Tang dynasty China, but I do find the whole story rather bland comparing with the source material (both history and folklore). There will be hardly any surprise in it if you're familiar w/ the actual history & some common Wuxia tropes.