London "hepcats" grow bored at a party one night and decide to go explore an old nearby estate that's supposedly haunted. Once there one of the gang is brutally knifed to death and the group is left to wonder if one of their own is a killer.

The Haunted House of Horror (also known simply as Horror House) is a swinging 60's British chiller that's a bit of a mixed-bag for horror fans. On the good side there's a couple of effectively shocking (and bloody) murder scenes, a nicely moody music score by Reg Tilsley, and the climax of the film is pleasingly intense. Unfortunately the rest of the film is hampered by a sluggish pacing and a fairly routine setup. The uneven performances from the cast don't help things either.

Still, overall Haunted House of Horror has enough going for it to make it an interesting watch - particularly for fans of British horror from this era or maybe for people who just hate Frankie Avalon.

** out of ****