So just what is inside that tower that we keep getting mysterious glimpses of? In this episode we find out it’s veteran actor Terence Stamp and a crazy boy in pyjamas who has taken the subtle knife from Tezza to protect himself from the Spectres. And he doesn’t want to give it up easily. Much of this episode dwells on somewhat familiar sorts of mystical objects and venerable teachers that abound in literary and visual fiction. So while Will and Lyra finally discover a way into the Tower of Angels, Scoresby tracks down John Parry or as he is currently calling himself Jopari which sounds like his Twitter name! Some of the intrigue is drawn away from these encounters by an introductory sequence which explains it all to us before the characters learn about it but really it should happen simultaneously. So as the kids gawp at the Subtle Knife we already know all about it . Incidentally Terence Stamp aka Giacomo Paradisi pitches this role just right. The actor can do these sort of roles, which amount to extended cameos, with authority and it works a treat.