this book expands "Hired Help" chapter from Old School Essentials classic core books in a sleek zine fashion. I only got digital book from KS campaign. 

Lists of available retainers are in order from 0 level, petty NPCs to potentially more powerful NPCs like elves. Totalling to 200, Each entry has a name, a short description of characters and what little possessions they have in bullet points. In the last chapter author gives a new and balanced ways to hire and also a quick ones.

 They do lack stats. However, when you look mercenaries in B/X, they usually only have Armor Class stats rather than full fledged character sheet for PCs (bear in mind they are not a part of adventuring party). This for me gives off a system neutral vibe also, and you may probably use this on other fantasy roleplaying game. (i.e. Five Torches Deep)

Spread layout is so easy to see and sparse illustrations and a map in the last page of the booklet serves practical purpose. They are truly welcoming addition for GMs who are looking to throw in some npcs on the fly as well as inspiration when you are wrappin your head around for a well thought out methods for hiring npcs.