Tunewriter Royalty Free Original Music
As the title says, this one is an interlude, but it could also be used as a suspension. It has some ethereal voicings behind a dark piano, and does indeed sound sinister, scary, and creepy. It is 17 measures in 4/4 time, at 120 beats per minute, with a total play time of 34 seconds.
Play Sinister Interlude