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  1. ***Dark Horse (Jim Knighthorse Book 1) (Repeat) by J.R. Rain. Price: Free. Genre: Hard-Boiled Mystery, Private Investigators. Rated: 4.3 stars on 463 Reviews. 345 pages. ASIN: B00408B12Y.

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  1. *Sole Survivor (Sole Justice Book 1) by Glenn Trust. Price: Free. Genre: Hard-Boiled Mystery, Police Procedurals. Rated: 4.6 stars on 42 Reviews. 301 pages. ASIN: B07RC51XFP.

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  1. *Tubby Dubonnet Mysteries Vol. 1-3 by Tony Dunbar. Price: Free. Genre: Hard-Boiled Mystery Boxed Set, Suspense. Rated: 4.2 stars on 57 Reviews. 581 pages. ASIN: B01ICBEWQG.

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  1. The After House (Musaicum Vintage Mysteries): A Private Yacht and Gruesome Triple Axe-Murders by Mary Roberts Rinehart. Price: Free. Genre: Hard-Boiled Mysteries. Rated: 4 stars on 57 Reviews. 161 pages. ASIN: B094D3HH63.

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  1. *Friend of the Departed (Stefan Kopriva Series Book 3) by Frank Zafiro. Price: Free. Genre: Hard-Boiled Mystery, Amateur Sleuth. Rated: 5 stars on 9 Reviews. 254 pages. ASIN: B016YPH3AE.

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  1. Dev Haskell Box Set Vol 1-3 by Mike Faricy. Price: Free. Genre: Hard-Boiled Mystery Boxed Set, Private Investigator. Rated: 4 stars on 56 Reviews. 701 pages. ASIN: B00NJ6T04E.

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  1. *Sugar Got Low (River City Short Stories) by Frank Zafiro. Price: Free. Genre: Hard-Boiled Mystery, Murder. Rated: 5 stars on 5 Reviews. 324 pages. ASIN: B08MVP8RRT.

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  1. Calamity (A Captain Grande Angil Mystery Book 1) by Robert G. Bernstein. Price: Free. Genre: Hard-Boiled Mystery, Sea Stories. Rated: 4.1 stars on 18 Reviews. 236 pages. ASIN: B007US6F8Q.

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  1. Sacrifice (Karre & Viktoria Crime Novels Book 1) by Tim Svart. Price: Free. Genre: Hard-Boiled Mysteries. Rated: 4.5 stars on 4 Reviews. 406 pages. ASIN: B089S77D29.

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  1. Hidden Variables: A Shawn Ronin Mystery Book 1 (The Shawn Ronin Mysteries) by Chris Racknor. Price: Free. Genre: Hard-Boiled Mysteries. Rated: 4.3 stars on 7 Reviews. 195 pages. ASIN: B085N6RCXS.
  2. *Confessions – A Johnny Walker Novel (Johnny Walker Novels Book 1) (Deal, Not Free) by Ralph Griffith. Price: $0.99. Genre: Hard boiled Mystery Deal of the Day, Sponsor, Johnny a cocaine addicted, alcoholic homicide detective receives a call that a priest has been murdered out at the Grotto. Rated: 4 stars on 4 Reviews. 201 pages. ASIN: B075CW6HWC.