So, who was sending...


... the text messages?

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The brother.

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It thought it was Ingo, the lover of the celebrity that she talked to (and revealed a lot to) while she was waiting to interrupt the celebrity's meeting.

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Clearly it was Ingo, which is why he was at the hotel towards the end. And to the dim-wit who said it was her brother, I guess her brother was also mysteriously paying cash for the reservations as well. Duh!

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And I also thought it was heavily implied at the end that her brother wasn't making any contact at all, ie he's dead, it was all in her head

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There were ghosts. A ghost broke a glass two times and we see him moving in the kitchen. And something walked out of the hotel as sensors were activated and opened doors.

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