Rebecca's World: Terry Nation

It was the eleventh day of the school holidays and Rebecca was bored. But events take a dramatic turn for the better (or worse) when she finds herself transported to a distant planet whose people are terrorized by jelly-like monsters called Ghosts. Her mission - to set out through the Forbidden Lands and find the Last Ghost Tree. Written by the man who gave the world - The Daleks. Illustrated by Larry Learmonth. And here's some dedicated souls on Goodreads and their fond memories of this part of their childhood: https://www.goodreads.com/book/show/1782359.Rebecca_s_World?from_search=true&from_srp=true&qid=sVvMhE8TfC&rank=1