Ruby van der Bogen is a mythical creature researcher. Fantasy worlds are her home. She dives under waves like a mermaid, gallops through rainbows like a unicorn, eats melons like a monster and realises how many things humans and mythical creatures have in common. In her books, she reveals the most exciting and fun facts that she has discovered during her research. She is advised by children who know her by her human name, Sarah Janke.