Possible Clues:

• Less reassuring, perhaps
• Like the 'The X-Files' vis-à-vis 'The Rockford Files'
• Ever begin to be comparatively uncanny
• Like "Halloween," and then some
• More ghoulish
• More Lovecraftian
• European monarch twice hosts one stranger
• More like an empty old mansion at night, say
• Stranger sounding than 21?
• Like 'Halloween,' and then some