Follow along with us on Facebook all year long for in-depth introductions to genre essentials, from Horror to Romance to Historical Fiction.

Each month we're suggesting books, posting quizzes, and generally stirring up discussion. All you need is a Facebook page; no extra sign-up necessary.

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May is Mystery Boot Camp! Mysteries are works of fiction that ask readers to help solve a puzzle, and mystery fans are also often drawn to the charismatic and complex detectives at the heart of the investigation. Many of today's mysteries are organized around this dual love of story and character.

Your challenge: pick 3 mystery novels to beef up on. Here are 20 of our handpicked mystery essentials»