In Murder on the Orient Express ( 2017 ) , Hubbard 's reaction proves that they lack killer 's instinct .
Hubbard grabs the gun and attempts suicide , but it is not loaded ; Poirot wanted to see how the suspects would react , and Hubbard 's reaction confirms that they are not killers at heart .
Murder on the Orient Express -LRB-2017 film-RRB-