Kevin McCloud meets Spanish architect Jaime and his wife Mimi as they embark on a mission to convert a Grade II listed folly into a family home in Buckinghamshire. Giving themselves a wildly optimistic six month deadline to finish before the birth of their second child, it's not long before the couple hit trouble. Jaime puts all his energies and creativity into the project, using innovative 3D mapping to squeeze living spaces into the tower, but it proves to be an exhausting struggle.