What inspired the choice to make the story revolve around a mysterious key?
Around the Web·mese scorso

La primera llave (Serie Ulysses Moore 6)

La primera llave (Serie Ulysses Moore 6)
La discussione tra lettori è aperta ora. Un autore verificato può intervenire dopo aver rivendicato questo profilo.
What inspired the choice to make the story revolve around a mysterious key?
Did anyone else feel the story balanced adventure and humor perfectly?
How did the author decide on the magical world’s rules and limitations?