What do You think about The Viking Symbol Mystery (1962)?
I grew up reading these Hardy Boys books, in fact, they are one the earliest books I remember reading at a young age. I picked up a few hardback copies from a library book sale mainly for nostalgia. After reading The Viking Symbol Mystery, I was reminded on why I liked these books, teen characters solving mysteries while traveling all over. This book has the Boys, their friends, and their father traveling to Canada to solve a mystery of several lodge break ins that are related to a Viking symbol. Granted this is not Agatha Christie mysteries, but for what they are, they are an enjoyable quick read for pleasure.
—Lance Lumley