City of Thieves (Wizard series 2 number 6), paperback Fighting Fantasy gamebook, by Ian Livingstone
“Terror stalks the night as Zanbar Bone and his bloodthirsty Moon Dogs hold the prosperous town of Silverton to ransom. Amongst the twisting, treacherous streets of Port Blacksand, you must seek the help of the wizard Nicodemus. Then you must journey to the most terrible place of all – the stronghold of the Night Prince himself, Zanbar Bone!”
The adventure sheet is unused.