- Seconds Away
- Seconds Before Sunrise
- Seconds Out
- Secret Academy - Gefährliche Liebe (Band 2)
- Secret Academy - Verborgene Gefühle (Band 1)
- Secret Admirer
- Secret Agent
- Secret Agent Grandma (Give Yourself Goosebumps #16)
- Secret Agent Josephine's ABCs
- Secret Agent Josephine's Numbers
- Secret Agent Robot Command
- Secret Ashes
- Secret Bedroom
- Secret City
- Secret Coders
- Secret Coders: Monsters & Modules
- Secret Coders: Paths & Portals
- Secret Coders: Potions & Parameters
- Secret Coders: Robots & Repeats
- Secret Coders: Secrets & Sequences
- Secret Deep
- Secret Files 3 The Archimedes Code Game Guide & Walkthrough
- Secret Friends' Stuff
- Secret Game. Brichst du die Regeln, brech ich dein Herz (Romantic Suspense meets Dark Academia)
- Secret Girls' Stuff
- Secret Guardians: The Rogues 2
- Secret Holiday
- Secret Identity
- Secret Identity of Devon Delaney
- Secret Illusions (Salmon Run - Book 4)
- Secret in St. Something
- Secret Keeper
- Secret Letters From 0 To 10
- Secret Lies
- Secret Life of a Teenage Siren
- Secret Meetings: The Heiresses Book 3
- Secret Neighbor Guide
- Secret of a T-Rex
- Secret of Betrayal
- Secret Of Bradbury Mansion
- Secret Of Devil Lake
- Secret of Nightingale Wood
- Secret of Omordion
- Secret of the Cave
- Secret of the Crystal Dragon
- Secret of the Dragon's Breath
- Secret of the Dragon's Eye
- Secret of the Lake: Book 1
- Secret of the Night Ponies
- Secret of the Red Arrow
- Secret of the Ron Mor Skerry
- Secret of The Saans
- Secret of the Scarab
- Secret of the Sea Dragons
- Secret of the Spa
- Secret of the Stone Lion
- Secret of the Storm
- Secret of the Super-small Superstar
- Secret of the Time Tablets: A Graphic Novel (Cleopatra in Space #3)
- Secret of the Tree
- Secret of the Warlock's Crypt
- Secret Power for Girls
- Secret Protector, Band 1: Tödliches Spiel
- Secret Protector, Band 2: Mörderische Erpressung
- Secret Protector, Band 3: Bedrohliches Vermächtnis
- Secret Romeo: A Gay Young Adult Romance Story
- Secret Sabotage
- Secret Santa
- Secret Schemes and Daring Dreams
- Secret Science: The Amazing World Beyond Your Eyes
- Secret Scribbled Notebooks
- Secret Seven Adventure 秘密七の冒険 (ESL/EFL日本語の注釈版)
- Secret Seven Mystery 秘密七謎の事件 (ESL/EFL日本語の注釈版)
- Secret Seven on the Trail 秘密七追跡中 (ESL/EFL日本語の注釈版)
- Secret Seven Win Through 秘密七優勝 (ESL/EFL日本語の注釈版)
- Secret Sexting
- Secret Sisters of the Salty Sea
- Secret Skies
- Secret Sky Garden
- Secret Songs
- Secret Star
- Secret Summers
- Secret Survivors
- Secret Weapons