Nancy Drew or the Hardy Boys?

Mystery novels starring the Hardy Boys and Nancy Drew have been around for over 80 years, and there are so many of them that it might be hard to tell them apart. If you love solving mysteries, you’ve probably read a lot of both series. In today’s Lunchtime Quiz at mental_floss, you’ll be given a title, and you decide whether it belongs to a Hardy Boys book or a Nancy Drew book. Simple? Don’t count on it! Link