As a child i remember reading a book about a Kid who had a Cat and went on strange adventures (possibly had witches involved) the names of the characters were (i think) Aaron, Tim, tobias(?) sebastian. this is all i can remember. anyone got any ideas or am i jus imagining it?
I also remember these books and have been searching for info. Additional info. for you that may jog your memory is I'm sure the boy could see the "invisible people" and there were "White Witches" involved.
So far my search has turned up the below but havn't been able to find reviews to confirm these are the books:
Tim and Tobias by Sheila McCullagh
The Key by Sheila McCullagh