Monster Mission/ The Secret Of Platform 13

'We must kidnap some children,' announced Aunt Etta. 'Young, strong ones. It will be dangerous, but it must be done.'

Three children are stolen and taken to a bizarre island, which is home to some extraordinary creatures - including mermaids, selkies and the legendary kraken. The island is the base for a very mysterious mission. But the magical adventure is cut short when the island is suddenly under siege. Can the children save themselves and their new friends?
THE SECRET OF PLATFORM 13
Under Platform 13 at King's Cross Station there is a secret door that leads to a magical island . . .

It appears only once every nine years. And when it opens, four mysterious figures step into the streets of London. A wizard, an ogre, a fey and a young hag have come to find the prince of their kingdom, stolen as a baby nine years before.

But the prince has become a horrible rich boy called Raymond Trottle, who doesn't understand magic and is determined not to be rescued.

The Secret of Platform 13 is an exciting magical adventure from Eva Ibbotson, the award-winning author of Journey to the River Sea.