Inside the mind of a killer

Images have been released of the Colorado cinema shooter James Holmes' booby trapped home, raising further questions as to his state of mind.

We are interested in learning more about what makes a killer tick. We'd like to look at one or more old cases (where convictions have occured and all court proceedings are complete) and talk to the people involved.

We'd also want to hear from an expert, but the key to this piece is access to the story that will be shared exclusively.

Please pitch by 15/09/2015.