Well executed, suspenseful fascinating film

I've no idea how accurate the movie is but all the squabbling, indecisions, delegations and discussions dealing with the legal and moral right or wrong was fascinating to behold. Great acting by all, especially of course Mirren and Rickman, whose performance here leaves us missing a fine actor who could have given us some great roles in the years to come.
Starts off slow and uninvolving but once the targets are identified becomes tense and suspenseful throughout. The scene at the 1 hour and 20 mark is nail bitingly suspenseful.