Premise: The Puppet Master is an album by King Diamond released in 2003. A limited edition includes a DVD on which King Diamond is telling the story of The Puppet Master. It is a concept album with a storyline telling the tale of a young couple who go to watch a puppet show in Budapest in the 1700s, and end up being turned into undead puppets by the Puppet Master and his wife.
Hypothesis: concept albums such as this one were amongst king diamonds worst commercial projects