When I was in England a few years ago, I got the book Spooks Apprentice. It’s a kids book but it was fun. I never got to finish the series but I might if I go back to England next year.
The ones I mentioned are not series as far as I know... besides HP, there is one other SciFi writer I’m hooked on...
Anne McCaffery
She has a set of three called :
To Ride Pegasus
Pegasus in Flight and
Pegasus in Space...
That rolls into a series starting with “The Rowan”...
And she also has a series called “The Dragon Riders of Pern” which my son (14) started to read... I have most of her books (if not all)
These are my “comfort” reads... when I just want to read a little, I pick one of these up and read my favorite parts.