Been reading Land of Roar series by Jenny McLachlan to my 9 year old and we're really enjoying them. Adventure, humour, interesting characters, great plots and the relationship dynamics and themes (growing up, peer pressures) are plausible and not clunky. Some illustrations too.
Twins about to start high school end up back in the land they created through their imaginary play when younger and have to battle their old adversary, a creepy scarecrow. One is keen to be seen as cool and grown up, her brother feels left behind and still likes to play. The twins are mixed race, although not much is made of it, if anyone has been searching for a book that isn't just more white kid heroes.
Some scary bits but fine for age 8/9/10 unless they scare easily. Or fear scarecrows.