When constabulary duty's to be done

A policeman's lot is not a happy one

Many, perhaps most fantasy lands are monarchies, which can be ruled well when the monarch is a clever and able man or woman devoted to his or her people. But what happens when the monarch is ill, or is tyrannically cruel, or a young child, or is otherwise blatantly unfit to rule? How can he or she be dealt with without risking civil war as powerful nobles fight for the crown?

'Though he walk through the most dangerous ghetto in the city, he shall fear no evil with Lawboon by his side.'