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Signal
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changing the past
message from the future
detective
cold case
profiler
police
murder
criminal profile
criminal psychology
serial murder
alternate timeline
female police officer
voice from future
butterfly effect
changing history
attempted murder
statute of limitations
murder case
grandfather paradox
supernatural power
kidnapping
criminal profiler
paranormal phenomenon
police radio
investigation
flashback
false accusation
corrupt cop
race against time
altering history
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