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After his wife and daughter are murdered, Judge Nicholas Marshall loses faith in the judicial system. Selecting defendants from the cases appearing in his court, he presses them into a different kind of community service, as members of a vigilante group nicknamed "The Night Watchman".
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Nick lets a murderer go because the only witness against him, is a foreigner who was deported. Nick knowing that the likelihood of him committing another crime is unlikely, so he decides to make the man incriminate himself for the crime he committed. He sets out to do this by giving him a drug that takes away his memory. When he wakes up, Nick tells him he's a detective and Nick is his partner and Cat is his girlfriend. And they are investigating the murder he committed with Moon playing him.