- Maximum Moxie
- May Day Murder
- May Misfire - A Yacht Yenta Mystery
- Maybe Alone
- Maybe Forgotten
- Mayhem (and Herring) (A European Voyage Cozy Mystery—Book 6)
- Mayhem and Matrimony
- Mayhem at the Mission
- Mayhem at the Orient Express
- Mayhem in High Heels
- Mayhem in Miniature
- Mayhem in the Library
- Maynely A Mystery
- Mayor for Murder
- Maze in Blue
- McCone and Friends
- Meadowlark
- Mean and Shellfish
- Mean Girl Murder
- Mean Streak
- Meanwhile, Back In Deadwood
- Measured for Murder
- Measured Mayhem
- Meddle No More
- Meddling and Murder
- Meddling In Murder
- Medeplichtig
- Medicine Bird
- Medieval to Modern: An Anthology of Historical Mystery Stories
- Medium At Large
- Medium Dead
- Medium Rare: Dead Man Talking
- Medusa & MYSTERY
- Medusa Effect
- Medusa: Naissance
- Meerkats and Murder
- Meet Isabel Puddles
- Meet Your Baker
- Meeting at the Rise and Shine
- Meeting Eve Deaux
- Meg Gardiner 3-Book Thriller Collection
- Meg Harris Mysteries 6-Book Bundle
- Meg Harris Mysteries 6-Book Bundle
- Meg Harris Mysteries 7-Book Bundle
- Megan and the Mysterious Boy
- Megan Scott/Michael Elliott Mystery Box Set: Books 1-3
- Megan Scott/Michael Elliott Mystery Box Set: Books 4-6
- Mehr Schatten als Licht
- Meisjes zoals wij
- Melancholy Baby
- Mele Kalikimaka Murder
- Melting Point
- Melting Steele
- Memoirs of an Arresting Woman
- Memories and Murder
- Memories are Murder
- Memories Can Be Murder: A Girl and Her Dog Cozy Mystery
- Memory Book
- Memory in Death
- Memory In Death
- Memory of Murder
- Men Under Fire
- Men, Love & Power
- Menace in Malmö
- Menacing Malice
- Mental Game: Smith Investigation Series 2 Book 4
- Mental Malice
- Mentiras y sueños
- Meow If It's Murder
- Meow Means Murder
- Mercedes Drew the collection
- Merchants of Souls
- Mercurium
- Mercury Rising
- Mercy
- Mercy & Mayhem: A Medical Cozy Mystery
- Mercy Creek
- Merit Badge Murder
- Merlin's Misfortune
- Mermaids on the Moon
- Merrie Axemas: A Killer Holiday Tale
- Merry Little Mystic Murder
- Merry Market Murder
- Merry Scary Victorian Christmas
- Merry, Merry Ghost
- Mesopotamia
- Message on the Tide
- Messenger of Truth
- Messo a tacere da un incantesimo (Un giallo intimo e leggero di Lacey Doyle–Libro 7)
- Met gelijke munt
- Metaphysics of a Dead Ex-Church Girl
- Methodical Malice
- Methusalem
- Meurtre (et Baklava) (Un voyage européen – Livre 1)
- Meurtre au bureau: une enquête pétillante
- Meurtre au Cadre Noir
- Meurtre au Manoir (Un Roman Policier de Lacey Doyle – Tome 1)
- Meurtre au Manoir d’Archly
- Meurtre en Eau Trouble (Un Thriller d'Alexa Chase - Tome 2)
- Meurtre à Albi
- Meurtre à Paris (Un an en Europe – Livre 1)
- Meurtres en promo
- Meurtres à Bayonne
- Mi primer muerto
- Mia amara signora
- Miami It's Murder
- Micah & Strange Candy
- Midlife Murder: A Texas Trailer Park Mystery
- Midnight Clear
- Midnight Come Again
- Midnight Crossing
- Midnight in Death
- Midnight In Death
- Midnight in Death/Interlude in Death
- Midnight in Malamulele
- Midnight in Malmö
- Midnight in Mongolia
- Midnight Pleasures With a Scoundrel
- Midnight Spells Murder
- Midsummer Meeting
- Midsummer Murder
- Midsummer Night's Mischief
- Midzomernacht
- Mightier than the Sword