- Unpredictable Events
- Unprotected Love
- Unprotected Sax
- Unpunished
- Unquenchable Desires
- Unquiet Ghosts
- Unquiet Spirit
- Unravel
- Unraveled
- Unraveled Sleeve
- Unraveled-Rewoven: Book 2 RIPPED-Lies Exposed
- Unraveled: The Story of Life and Living
- Unraveling Oliver
- Unravelled Knots
- Unravelled Knots: The Teahouse Detective
- Unrealistic
- Unreap my Heart
- Unreasonable Doubts
- Unreasonable Risk
- Unrelated Incidents
- Unrelenting Nightmare
- Unrelenting Peril
- Unremarkable
- Unremembered
- Unrepentant
- Unrest
- Unrevealed
- Unrevealed
- Unringing the Bell
- Unruly Passions
- Uns quants dies de gener (Inspector Mascarell 12)
- Uns quants dies de novembre (Inspector Mascarell 11)
- Unsafe Deposit
- Unsafe Distances
- Unsafe Harbor
- Unsafe Haven
- Unsafe Keeping
- Unsanft entschlafen
- Unsanfte Ostern
- Unsaved: The Small Hours, Book One
- Unsavory Company
- Unscheduled Arrival
- Unscheduled Murder Trip
- Unschuldig
- UnSchuldig. Friesland - Thriller
- Unschuldige Täter
- Unschuldiges Begehren
- Unschuldsengel
- Unscrewed
- Unscrupulous
- Unscrupulous gold digger
- Unseemly Exposure
- Unseemly Fate
- Unseemly Honeymoon
- Unseemly Science
- Unseen (with bonus novella "Busted")
- Unseen Bonds
- Unseen Demons
- Unseen Witness
- Unseen: A Sage Adair Historical Mystery
- Unselig sind die Friedfertigen
- Unser aller Erbe. Island-Krimi
- Unser täglich Blut
- Unser tägliches Brot
- Unsere Armen und Elenden
- Unsere dunkle Seite
- Unsere Heilige Ehre (Ein Luke Stone Thriller—Buch 6)
- Unsettled Spirits (A Daisy Gumm Majesty Mystery, Book 10)
- Unshielded Past
- Unsicherheit
- Unsichtbare Spuren
- Unsightly Bulges
- Unsinkable
- Unsolicited
- Unsolved Abduction
- Unsolved Case
- Unsolved Mysteries: Real Life Mysteries: Ten Famous Disappearances
- Unsortiert
- Unsound