The Doctor once again promises Amy and Rory another exciting planet. Instead they materialise in what appears to be an hotel done out in 1980s decor
They soon encounter a group of people from Earth (and elsewhere) who have been gathered in the hotel for some reason. They appear to be compelled to open bedroom doors at random where they are faced with someone's greatest fear, e.g. a clown, a PE instructor, girls laughing at a stutter, the Weeping Angels, etc. Eventually they stumble upon their own fear and start to 'praise him'.
Him being a big monster bloke with horns who is wandering around the hotel looking for the person currently doing the praising. Whereupon they are dead.
So understandably the Doctor wants to get his chums out of danger. Along the way he works out that the monster doesn't want their fear, rather he feeds on their faith. The fear is just a way of exposing one's faith.
Amy is next to utter the dreaded 'praise him' and the Doctor finds the room with her fear: It's young Amelia sitting waiting for the doctor to return as promised. Amy's faith is in the Doctor so he he convinces Amy that she shouldn't have faith in him, that he only tool her along in the Tardis to impress her.
That pretty much defeats the monster bloke and the hotel is revealed to be a space prison. The unfortunates that ended up there were basically delivered as the monster's food.
The Doctor brings Amy and Rory back to Earth and gives them a house and a red sports car. It's goodbye as he's worried he'll get them killed.
So it appears to be goodbye Amy, at least for now. However given that the series finalie is almost upon us I would expect it to deal with the Silence, River Song, the astronaut in the lake that kills the Doctor, and that woman with the eyepatche thing. I think Amy needs to be back for all that.
Ah, but I have forgotten something. While exploring the hotel the Doctor opens the door to room 11. We don't sew what's inside but the Doctor says 'of course' and we hear what sounds like the Tardis cloister bell... Interesting.
Next week: the bloke from last years Lodger episode and Cybermen.