First, I need to say up front that I'm reading this in the wrong order. It is by internal chronology the very first story, in which Dr. Bairstow gets funding for time travel, secures the premises of St. Mary's, and recruits the team vital to the St. Mary's project. At the same time, in fact, this story was written after several other, "later" stories, where St. Mary's is up and running, and the characters are settled into their roles. So it's safe to assume that those who have read those "later," previously written stories will find additional pleasure and satisfaction in seeing the team gathered and the project begun.
Despite the fact that I doubt I'm getting the full pleasure of it, I really enjoyed this story. It's a great look at the importance of history, accompanied by a certain gallows humor that tickles my own twisted sense of humor. I especially love the way Dr. Bairstow cheerfully promises his prospective recruits that yes, the working conditions will be hard, but on the other hand, the pay will be really awful.
It's just a short, perhaps novella in length, and as I've clearly warned, there's an assumption that you've read at least one or two of the others. Despite that, definitely recommended. It's a lot of fun.
Audible was (maybe is?) offering this one for free.