Dertien rennende hertjes

Moonie is quietly staring at a blue vase when all of sudden thirteen blue deer jump out of it. They call her "Duchess", but they don't stay long and disappear in a poster of the sea. Moonie wants to tell her mother what she had seen, but her brother Raf tells her not to. He also saw an animal once, but when he told his father it disappeared forever.
A moving story about the power of fantasy by a Dutch author and a Flemish illustrator.