What I tend to enjoy the most is historical fiction based around areas of history I enjoy. One of my favorite books of all time is 'The Telling Pool', which takes place during the third crusade. I also like some horror/thrillers if they're written right, also like some sci-fi/fantasy. I also love Choose Your Own Adventures, no matter what age those books are awesome.

I have a hard-back copy of this compilation of Lovecraft's short stories which I need to start reading:

Currently reading a lot of Jo Nesbo. I was going to switch author for a while after two books from him but the last one ended on a bit of a cliffhanger so that plan went out the window. 

Any more Nordic/Scandi-Noir authors you could recommend? (In English obviously, because I'm very self-consciously monolingual).

I read the Stieg Larssen/Girl With A Weird-assed Personality series of books, including the continuation of the series by the guy who's name I can't remember, and the first three originals are definitely best. I got started on Jo Nesbo, read the first one, found it pretty good, but then got bored with the second.

I also went through all the Kathy Reichs/Temperance Brennan series, and loved those. Never got into the TV series though.

Also enjoyed JK Rowling's Cormoran Strike books. Yes, it's hacky detective fiction, but whatever you think of her, JK can tell a story.

And I'm also quite partial to a John Le Carre book or two. His writing seems to be so effortlessly stylish, and conjures some brilliant imagery, and memories of the shadier side of the post-WWII period, both during and after the Cold War.

Currently reading Neal Stephenson's "Fall, or Dodge in Hell". I've got a bit bogged around the middle of the book, but that's got more to do with my current work/life situation than the book itself. I'm also listening to the audiobooks of Stephenson's "Seveneves" which I have already read, and am up to "Blue Mars" in Kim Stanley Robinson's Mars triology, although that is on hold at the moment, because it's what I listen to when I'm driving.

Nesbo doesn't become true Nordic Noir until book 3. Out of the five I've read of the Harry Hole series books 3 & 5 were my favourites. 3 through 5 each have their own plot but also form a loose trilogy. 

Other authors I've enjoyed in this genre are:

Mons Kallentoft (Swedish) - these are a bit different because there's actually a supernatural element within them, yet that has no bearing on the outcome of the stories, only the manner in which they're told. I've only read the first two so far but very eager to continue. A favourite after Larsson and Nesbo. 

Anne Holt (Norwegian) - I've read the first two of the Hanne Wilhelmsen series with 3 standing by. Pretty good. 

Erik Axel Sund (Swedish) - there's only one book in English, The Crow Girl, which was three books in the original Swedish. A significantly more psychological book than some of the others I've read. I found it a riveting read personally. 

Samuel Bjork (Norwegian) - I've read the first of three called I'm Travelling Alone. Couldn't put it down. 

Ragnar Jónasson (Icelandic) - read one. A slower burn than some for a short book. Probably spends too much time building up its main character and his background without furthering the actual crime of the novel. Good once it got going. Would read more but his books aren't the easiest to find here.

Some other authors in this genre I have books lined up from but haven't read yet would be: Alex Dahl, Camilla Grebe, Lotte and Soren Hammer, Camilla Läckberg, Åsa Larsson, Håkan Nesser, Yrsa Sigurðardóttir  and Søren Sveistrup.