Lloyd and Harvey adjust to their new foster sister as Dinah Glass is adopted by the Hunter family. As Dinah goes to school, she meets the Headmaster for the first time...can she resist the headmasters mind control?
Dinah struggles to get on with Lloyd and Harvey, as snow falls. A snowball fight breaks out and Dinah, Lloyd and Harvey are forced to clear up the snow on the school yard into snowballs. Dinah joins an exclusive group.
The school is going to appear on the televised school quiz, the Eddie Hair show and the Headmaster forces Dinah to be on the school team.
A new computer game, Octopus Dare, craze breaks out in the school and everyone is playing it. When Dinah plays the game she wins and gets an invite to play in the games finals. Dinah begins to behave strangely and soon the game is all she can think about.
Dinah arrives at Vulcan Towers, where the final of Octopus Dares is to be played. Lloyd and Harvey worry about Dinah's safety and look to save her.
Dinah begins to work out what is going on and everything hinges on her friends rescuing her.