I'm looking for a good contemporary mystery written in the third person. I'm specifically interested in detective fiction with a proper whodunit at the core. It could feature an amateur detective, private detective, or any type of investigator as the protagonist. I don't mind book series at all, as long as the characterization is good and the mystery element is handled well.
I'm basically eager to get my hands on the type of book you can't put down with a protagonist you can either connect with, or who fascinates the heck out of you.
I've read quite a few YA mysteries back in the day, so I would prefer a mature read. :)