Moomminsummer Madness by Tove Jansson ( Midsummer Danger). I found it highly relevant.
I found lot of stuff about these books here
It's absolutely wonderful blog by Oliver Weiss illustrator and author. look
I used to have paper edition books by Tove Jansson, but not any more. Lost while moving countries. E-books are fine, but not the same. Why not to buy new ones?