3 books in series

I Wonder

I Wonder is a 3-book series with 3 released primary works first released in 1996 with contributions by Pauline Youd.

Cyfres Llyfrau Rhyfeddod: Pam Fod Andreas Wedi Synnu?
Cyfres Llyfrau Rhyfeddod: Pam Fod Pharo Mewn Penbleth?
Why Was Daniel Scared