Mel, Ludo and Wren are battling a new enemy - the sinister order of Ters, who have created storms over the city of Vlam. After a cry for help from a land in the Mirrorscape, the three friends go back into that strange and unpredictable world behind some paintings. They make new friends - and enemies - as they attempt to prevent the storms that threaten Vlam with a plague of demons. A tale involving kidnap, invisible burglary, tunnel-licking monsters and a battalion of moth bodyguards . . .