Zoe Taylor’s brainwave idea is either brilliant or insane: she isn’t sure which. But the more she tries to forget about it, the more it haunts her, until finally, even though it feels impossible, she makes a start. She never expects to succeed, but she has to at least try to turn her theory into practice, so that the whole world can benefit. How hard can it be?

*History Maps. Where the past comes to life in a phone app. Want to know what your street looked like 100 years ago? Five hundred? A thousand? History Maps will take you there, in clear, three-dimensional, navigable graphics. University history and graphic arts students, working together with local amateur history societies, combine their skills and knowledge to bring this incredible time machine to your computer or smart phone.*

That’s the theory, at least. Can Zoe pull it off? It seems so simple, and yet so complicated. Some people want to help her–eventually. Others never stop trying to put a spoke in the wheels, even when pretending to be on her side. All Zoe wants to do is to make it happen, give her idea to the world and then retire back to her normal family life. But can she ever get it off the ground? And if she does, will it ever let her go?