The people of Saint Marie go into mourning when Dezzie Dixon, the island's favourite radio presenter, is murdered live on air and Jack must unravel a challenging mystery to find the culprit. However, his task is made all the more difficult when Detective Sergeant Madeleine Dumas from internal affairs arrives to assess working practices following the recent shooting, and proceeds to question the inspector's every move. Richard Blackwood guest stars in the whodunit, with Ardal O'Hanlon and Aude Legastelois.