"Heimir Geirsson’s book is a well written presentation, motivation, and defense of a systematic semantic and metaphysical theory of propositions and propositional attitudes. The last century of work on this particular topic is vast and thorny. However, Geirsson does a nice job of guiding his reader through the most important issues and views. Moreover, Geirsson’s own unique view is interesting and may accommodate many of our seemingly incompatible intuitions."– Joshua Spencer, University of Wisconsin – Milwaukee, USA"...I think that the book is more than worth reading by interested researchers, as it provides a very clear overview of current debates in the philosophy of language...." – Gregory Bochner, Università di Bologna, Italy/Université Libre de Bruxelles, Belgium in Notre Dame Philosophical Reviews