About the thief In the house and the person who stood behind the door when MC and Cassandra were "busy".
For me, Helen is a red herring. She wasn't behind the door and she's not the person who stole anything or snooped around everywhere or messed up Sophie's stuff.
Do you guys remember the girl at the train station? Cassandra picked her up. Based on the similarities, I'd say she's probably her daughter or niece (daughter of Claire, the third Hill sister, perhaps?).
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The girl was driving with Cassandra in her car when Cassandra gave MC her number.
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And later Cassandra arrives to Kate's house with her, as evidenced by the shoes on the front door and the third plate at the table after returning with Eve because of her leg injury (Shoot out to my buddy
NextStrength2342 he saw it first).
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Most likely the thief and the person behind the bathroom door in MCs and Mike's room, as MC and Cassie had sex, is the still unknown girl from the train station.
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Later, when MC returns from the bathroom to the first floor to Kate and Cassandra, only Cassie's shoes are left in the hallway. Really suspicious.
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So for me the thief is the girl from the train station.