Here's a few good books you can all check out:
Nisioisin's "Kubikiri Cycle"
Christie's "And Then There Were None"
Rex Stout's "Fer de Lance"
Really any of Rex Stout's Nero Wolfe mysteries.
Shimoda's "Tokyo Zodiac Murders"
Michael Crichton's "The Andromeda Strain"
Le Guin's "The Tombs of Attuan"
Mio Chizuru's "Pirate Girl Yuuri" (Aptly titled "The Pirate and the Princess" in the English translation. Kid's books. Great for sci-fi/fantasy lovers)
Terry Pratchett. All Terry Pratchett. Forever.
Haruka Takachiho's "The Dirty Pair"
Maurice LeBlanc's "The Extraordinary Adventures of Arsene Lupin, Gentleman Burglar"
You know what? All of Maurice Leblanc's Arsene Lupin stories.
And if you're willing to sit in front of a PC for eight volumes of utter mystery joy, Ryuukishi07's "Umineko no Naku Koro Ni," which is the greatest thing ever written. It's the best thing. I mean...just the best. How is it so good? How? It's weird that a thing can be this good. You're just minding your own business, thinking, "Boy, that one thing? It's really good. Nothing could be better than that." Then you read Umineko. 'The hell?