- A unique tale of one person with two personalities that talk to each other but never meet. 
 - Carly gets the day and Kaitlyn gets the night, talking to each other through diary entries. 
 - While Carly is the 'good' personality, Kaitlyn is much more disturbed. 
 - Leaves the reader questioning if either personality is real, or created. 
 - Set in a boarding school. 
 - Murder mystery - we are told at the beginning that a fire happens, leaving the reader to guess who died. 
 - The story is told through the use of diary entries, psychiatric reports and witness testimonies.