Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Kate Beckett:  He steals her car and she kills him ? Why does n't she just put in an insurance claim and call it a day ?
Richard Castle: Ah . Because it was n't about the car . See , when Henry stole the vehicle , he took some thing of value from the inside . That 's what the assassin was trying to retrieve from his body .
Kate Beckett: And said stolen item was ... ?
Richard Castle: Cold fusion technology . Genetically engineered super virus . Some secret ... unpublished Harry Potter manuscript .
Kate Beckett: Actually , one thing that you said does make sense .
Richard Castle: * _ One _ * ?

thing