Oh dear
Basil Rathbone, Boris Karloff, Universal with the stars, this ticked all the boxes for me and I was looking forward to a real fun 90 minutes.
Sadly, this is a terrible clunker. The story is uninteresting, partly because it is too involved and needs to be laboriously explained along the way; many of the fights are worse than 60s TV; the Tower itself is well realized but other scenery is remarkably terrible. Glad to have rented rather than bought.