The enigma/main plot line of a thriller such as that of 'The Sixth Sense' is only fully resolved at the end of the film. For example when Dr Malcom is revealed to have been a dead person who needed to discover this for himself it is then made clear as to why no one else paid him any attention throughout the film (minus Cole Sear who 'can see dead people') and as to why his wife is seen to be grieving each night when he returns home.
Another convention of thrillers comes with the objectification of female charecters. For example within 'Distrubia' we as the audience are encoruaged to look at the female teenager who eventually partners up with the protaganist as someone to look at for there physical apperance rather than how they feel or there charecter traits.
Another convention of Thrillers consists of seeing the protagonist of the film being 'in peril' in the final few scenes before the resolution of the film is made. For example within 'Distrubia' before the anatagonist is over come it would appear the protaganist is in danger and is almost certain of being defeated by the anatagonist.