Skeleton Jack is the prologue and can be done in 4 hours since character creation is pretty quick in CfB games, however, to really get into the weirdness, I would suggest running the Beast Beneath or Mermaids' Grotto minus the optional question.
If you're into sneaking around a port town avoiding the British while looking for an animated skeleton, then go with Skeleton Jack. The complexity is only a 6 so it's doable.