• Detective Andrew O'Brien is a colleague and companion to Corcoran and Maguire. Often teased about his acquiescence to his overbearing wife, he is fiercely loyal to his family and friends. Leaving a trail of tobacco spit in his wake, O'Brien never turns down the opportunity to have a drink or a laugh. Faithful to – and slightly afraid of – his wife, O'Brien will visit Eva's for a drink, but never goes upstairs.