A young schoolgirl called Debbie wonders into an old curiosity shop. There, she stumbles on a game called "Wonders in Letterland", which, to her surprise, comes alive. Befriending the game's inhabitants, Debbie soon learns of the evil witch T-Bag, and soon finds herself charged with locating a series of missing letters....

Debbie must learn the name of a guard in order to advance to the next stage of her quest...

Debbie befriends a friendly skipper called McKipper, who nails himself a treasured find in the form of a golden S, only to throw it back into the sea. Debbie and McSkipper embark on a search beneath the waves and encounter T-Bag and Seraphina the Seasprite...

Debbie and Polar Pete are presented with a problem when T-Bag locks the letter P deep within an icy prison

Debbie embarks on a treasure hunt when her letters are taken by the pirate Rascally Roger...

Debbie helps the elderly Fife O'Clock get his clock working again...

T-Bag, Debbie and T-Shirt arrive in the final zone of the Letterland game, where they must make a melancholy emperor laugh in order to attain his gold necklace..

Debbie and T-Shirt race back to the beginning of the game, but find that T-Bag has a surprise up her sleeve that puts things in her favor. Can Debbie unravel the secret of the chest?