Once again Isla returns to Atalan only this time her best friend Ellie accompanies her. Isla has taken Ellie there to meet the unkerdunkies as a treat for her an upcoming birthday. On their arrival in the unkerdunkies village, the pair are chased through the forest by a mysterious creature. During their escape they run into Fartybubble and Oliver who have also been forced to flee the village from the terrifying beast.

Isla, Ellie and the two unkerdunkies travel to see the chief high wizard to try and find out what is going on. They discover that a portal to another dimension has been accidental opened, caused by a spell that went wrong. This new dimension is called Nalata and is home to many weird and wonderful creatures as well as a tribe of vicious ogres.

Isla and her friends must travel through the portal and help the chief high wizard and Wally find a way to close it and prevent the ogres from invading Atalan.

Can Isla and her friends once again save the day and keep Atalan safe, and will Ellie finally get to celebrate her birthday?!