This was a very traditional Gothic drama where suspense rather than gory special effects drove the film and it did it very well.
A lot of people have also commented on the 'wokeness' of the cast, which shows they don't know much about history. There were quite a few black showmen and indeed at that time pharmacist were snake oil salesmen. One was quite famous in my dad's youth (1920s, he was an older parent) and he touted his witch doctor credentials around the U. K. on racecourses etc, doing pretty much what the character was doing. He was from London and originally came as crew for an incoming ship, so all these derogatory reviews about the 'wokeness' of the film are nonsense.
All in all this was a well played film and leaned towards the gothic stories exceedingly well. I think that the use of Harry Price's name was a little pointless though, unless they intended it to be a series which never got made.
