Hlidara Mothril is an Altmer who is the chaplain and chief advisor of Alessia Caro, Countess of Leyawiin. She knows about a secret passage in the Countess's quarters leading to an actual torture chamber for Argonians and Khajiits.
She can be found in the dining area of Castle Leyawiin at around 8 pm, and follows Alessia Caro all day wherever she goes, including during the Countess' monthly pilgrimage to Chorrol.