Tom and Emily as children, journey from Edwardian England in 1903 to another world, through an inter-dimensional portal.

The World of Gossamer is ruled by magic and our heroes help to defeat a dragon using a magic crystal, in their first adventure.

Many years later when they are adults, they have a second adventure, when they are called on to save Gossamer from a far worse fate.
The world of 'fairy people' is now threatened by the Crustaceans. Resembling crab-like creatures, the invaders first seek to change Gossamer's atmosphere to a poisonous mix they can breathe, before travelling from their nearby moon through another portal, to make this world their own.
Tom and Emily must bring all their scientific skills learned on Earth and enlist help from Tom's disbelieving botanist father, to destroy the portal and restore the ecological balance to Gossamer to save their friends.

Plus

A bonus unrelated story of a time traveller who visits a spectacular Exhibition in 1902 Edwardian England.