Overview
Let Us Prey is a 2014 horror film directed by Brian O'Malley and written by Fiona Watson and David Cairns.
Plot
A mysterious man arrives in a small town in Scotland where PC Rachel Heggie awakens from a nightmare about being abused as a child before heading out on patrol. Whilst on patrol, Heggie witnesses Francis "Caesar" Sargison's car strike the mystery man. He disappears, and Heggie arrests Caesar. At the police station, she is greeted by Sgt Jim Macready, who charges Caesar with reckless driving. Heggie radios PCs Jennifer Mundie and Jack Warnock to find the victim before taking Caesar to the cells, where he joins his teacher, Mr. Ralph Beswick, arrested for beating his wife.
Mundie and Warnock, having found the man that Caesar hit, bring him to the station, mute, covered in scratches and carrying only a notebook with lists of names. Heggie phones Dr. Duncan Hume to examine him; however, upon examination Hume experiences a flashback and attempts to kill his patient for supposedly knowing what Hume has done. Hume is placed in a cell, and the unknown man is identified as having the fingerprints of an old man who died over 20 years ago. He makes several references to Old Testament justice before Macready also suffers a flashback and angrily has Heggie and Mundie place him in cell six (and for this reason the character is named "Six" in the end credits, although never referred to as such by any other characters during the film). Mundie has a flashback to beating a prisoner with Warnock.
Macready has Mundie and Warnock go to Hume's house to find his wife before Macready drives to his own home. Heggie researches the names in Six's notebook, discovering they are all deceased criminals. In the cells, Six, who displays supernatural powers, quizzes Beswick about the true reason why he beats his wife. Unsatisfied with Beswick's answers, Six induces him to attempt suicide. Caesar alerts Heggie, who allows Hume to examine Beswick, who dies after claiming to know who Six is. Elsewhere, Mundie and Warnock enter Hume's house and find he has murdered his family. Macready is revealed to be a serial killer who seduces and then murders young men, as shown by several missing posters in the police station. He hurriedly disposes of a dismembered body in his fridge along with the body of one of the men shown on the posters, whom he had beaten to death in a drunken rage.
From Wikipedia (CC BY-SA 4.0).