Right from the start, the music is intrusive with tense motifs used as people walk through doors with no peril. The music also cliched.
As we move through episode 1, we can't build empathy with Jill Halfpenny's character as she becomes pretty creepy. You can almost hear the alarm bells ringing in the ears of the School HR lady.. and wonder why nobody else can hear them.
But if you want tension, the second half of the episode delivers. It's just that it's the type of tension that makes me want to turn off, rather than go look for the next episode.
A shame.