Top Ten Tuesday: Books for People Who Liked Tana French

This week's theme poses its own challenge. I love the idea of recommending books similar to a favourite author, but which author to focus on? Do I pick an author I find comforting and warm, or an author I find challenging? Do I find an adult author or young adult? Do I focus on classics or on modern writers? I want to pick my favourite author and rave about them... but again I have so many favourites...