THE SECRET OF PLATFORM 13 by Eva Ibbotson
Under Platform 13 at Kings Cross Station is hidden a quite remarkable secret. Every nine years a doorway opens to an amazing, fantastical island. Nine years ago, the island's baby prince was stolen on the streets of London. Now a rescue party, led by a wizard and an ogre, must find him and bring him back. But the kind prince has become a spoilt rich boy, who doesn't believe in magic and doesn't want to go home. Can they rescue him before time runs out - and the doorway disappears for ever?
I only recently discovered Eva Ibbotson but I completely adore her work! I'm delighted by everything I've read of hers so far. This is fun adventure that completely satisfies (even if it doesn't surprise). Look forward to more Eva Ibbotson book recommendations soon!