The Twills Gate links two very different realms. On one side of the portal is Senal, an advanced technological civilization of some thirty billion inhabitants. On the other side is Irion, where the world is flat and mighty wizards once ruled. Jedda Martele, a linguist from Senal, shares her people's assumption that Irion is backwards and superstitious and no match for her homeland's superior numbers and science. But as the two realms march inevitably towards war, Jedda finds herself at the centre of unimaginable events that will challenge everything she has ever believed about the world - and herself.