Started watching this knowing zero about it (my bad) but after 2 and a half episodes realised it's clearly based on a book series (in a good way) just not giving the (ignorant) viewer a heads up on the different timelines- to the extent my partner walked in on the end of ep 3 watched on from there, and thanks to the synopsis of ep 9 got all of it. However it's great fun with great humour, and i understand the first few episodes detailing the back story, can't wait for the next series now!