I came to know about author Ian Rankin in a very round-about way. Back in 2011, someone on DU did a wonderful post about some mysterious and amazingly intricate paper sculptures that had been showing up anonymously in various libraries and other cultural institutions in and around Edinburgh. I can't find the post, but here's a wikipedia article about them: http://en.wikipedia.org/wiki/Scottish_book_sculptures
Anyway, a couple of the sculptures involved references to Ian Rankin so I looked him up. I found out that he was a very big deal in the mystery genre in Scotland so I checked out the fiction shelf in my library and found one title by him. I read it and decided I wanted to read the entire series, which I did over the next two years - up to the very last book in the series which came out in 2013.
I am totally OCD about reading series in order, so of course I would recommend starting at the beginning and reading them in order. Rebus ages, he even retires and then comes back, and every single story is intriguing and entertaining. And if Rankin should ever write another Rebus book, I'll definitely rush to get my name on the library waiting list.