Ok these are my suspects for the show harper's island.
Henry-Seems like a great guy he's got everybody's trust so it could be easy for him. In murders he always shows up just a tad bit late. He has good knowledge of the island and is good with guns so very shifty.
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Cal&Chloe- They are very shifty. She has a thing for serial kilers. and he doens't know anybody to them this could just be all a game. They are very smart and it seems like one person is distracted at every murder.
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Shea- Shea seems very sweet and innocent but usually the killer is the person you least suspect nobody would think little shea would be the killer but with all her drama you never know.
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J.D- Although it seems a little too obvious he is one of Madison's "Friends on the island" he could definately be putting thoughts into her head because she is the one who wouldn't spill the beans. Plus he always is around.
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Beth-She's a charecter that's laying low and seems to be a bit shifty something we don't know about her.
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Katherine- Perfect farytale the evil stepmother having an affair doesn't seem to be too concerend about her daughter or henry and is just a little too laid back.
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Jimmy- Harper's Globe i know he's cheshire cat. He is somebody who could be after Abbey. He's coming off as a nice guy but he just seems like somebody who would kill.
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Malcom- He'd do anything to help his buisness clearly even try to sink a boat.
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Richard- Your savior is also your betrayor. Betrayor pointing to killer. and savior he saved Trish's life in the pool. or it may just point to something in her past
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That's it!