sentences:  After several discoveries and unofficial investigations led by Hunt and Drake, it is revealed that the newly introduced character, Charlie Mackintosh (Roger Allam) is heavily involved in the corruption.During episode four, after finding out that Hunt and Drake know about his corruption, Mackintosh shoots himself and with his dying words warns Hunt and Drake of "Operation Rose", but dies before he can reveal more details.Summers, also involved in Operation Rose, plants a tape stolen from Drake on Hunt's desk on which she had questioned his existence and motives.