Recommend a book where I can turn off my brain and read and enjoy

The last few books I read were extremely heavy in terms of themes and subjects they were dealing with and while each and every one of those were phenomenal, I just want something that won't make me think or disturb me or have an emotional impact on me (unless it is making me happy).

No YA or fantasy or smut.

I would love an unputdownable crime thriller or mystery (I don't mind plot holes or predictable story lines) or a cliched, cutesy romance. Preferably a contemporary storyline.