Love how these threads so often end up being about what we loved reading as kids! I read some thrillers when I was about 8-12 by an author called Malcolm somebody! Could even be somebody Malcolm! Helpful huh?! They were a bit Famous Five like but more grown up I guess and would have been written in the 70s or 80s. Had a trawl on Amazon but nothing's ringing any bells. I remember another book I loved at the time was called The Silver Crown and was similarly exciting! Wonder if anyone can vaguely remember what I might be after 