For full disclosure I did not read all of this book, just the sections that were relevant to the project I am working on.
Ankersmit's book is a very intelligent and challenging exploration of the role language plays in constructing histories, and the ethical importance of working with histories, rather than History. Ankersmit is very interested in the nature of representation, which it turns out is a much more complex question than one might initially think. Ankersmit's theory suggests (if I understand him correctly) that representation is the wrong way to go about thinking about history, instead of thinking that a text 'represents' say the Renaissance, we should say that the text is 'about' the Renaissance. Although this may seem like a minor distinction, 'aboutness' acknowledges the limitedness of any given historical account and the multiplicity of other accounts that all have some degree of validity in describing a particular historical event, era, or trend. In other words, to be 'about' an event like the Renaissance suggests that this individual historical account presents a specific interpretation of one or more components of the thing being linguistically identified as the 'Renaissance,' but there are other potential accounts focusing on other potential components and understanding the term 'Renaissance' in a different way.