As a kid, I found translations of Enid Blyton's books, e.g. The famous five, in my mothers book case. They must have been huge in their time. For my generation (1980), these books are basically unknown. I found a bunch of lookalikes from other authors too.

I thought these would become extinct by now, but googling around for writing this post, I just find the BBC created a series about them recently. They're back!