Charles Rennie Mackintosh is one of the most influential architects of the 20th century, but the contribution of his wife and artistic partner has often been overlooked. This film sets out to redress the balance by exploring their enduring relationship. Shot on location in Scotland, France and Austria, the story is told through a re-examination of the Mackintosh legacy and the extent of Margaret's influence on his work, from the Glasgow School of Art to the Hill House and Scotland Street School. With contributions from John Bellany, Benedetta Tagliabue and Jonathan Meades.