In his book, Peter Rohs develops a dualism of process-types founded in a theory of time: a type of mental processes belonging to a time-theoretical ontology and a type of physical processes belonging to a timeless ontology (the ontology of physics). This dualism should be proved as a basis for a non-naturalistic philosophy of mind, through which a libertarian concept of freedom and of personal autonomy can be defended. This theory is, as Rohs tries to demonstrate, compatible with the theory of evolution.