"The Eyes Have It" is a fantasy short story by Randall Garrett, the first to feature his alternate history detective Lord Darcy.
The story is set in an alternate world whose history diverged from our own during the reign of King Richard the Lionheart, in which most of western Europe and the Americas are united in an Angevin Empire and ruled under a feudal system.
Detective Lord Darcy is called upon to investigate the apparent murder of Count D'Evreux, who was found shot in his bedroom.
A gun is found hidden nearby, and Darcy's assistant, sorcerer Sean O'Lochlainn, determines by magic that it was used to kill the Count.
The Duke comments that the way the Countess defended herself and then hid her involvement shows her judgement and ability to act under pressure, which will aid her in her new role.