Series starting with T
- The 22 Immutable Laws
- The 39 Clues
- The 39 Clues: Cahills vs. Vespers
- The 39 Clues: Doublecross
- The 39 Clues (Scholastic Inc.)
- The 3Ts
- The 4-Hour
- The 500
- The 5th Wave
- The 6th Messiah
- The 7 Deaths of Evelyn Hardcastle
- The 85th Copper Mountain Rodeo
- The Abbey Mysteries
- The Abbott Family
- The ABC of Fonts
- The Abominable Charles Christopher
- The Absolute Authority
- The Absolute Sandman
- The Academic Writer's Handbook
- The Academy
- The Academy of Kindness
- The Academy Series
- The Accursed Kings
- The Achtsamkeitsromane
- The Acme Novelty Library
- The Acts of Caine
- the Adair Family Series
- The Adam Stanley Thriller Series
- The Adept
- The ADHD Effect
- The Adirondack Pinkertons
- The Adventure
- The Adventure Series
- The Adventures of Agnes Hopper
- The Adventures of Anthony Villiers
- The Adventures of Bertie and Jeeves
- The Adventures of Finnegan Dragonbender
- The Adventures of Frank Race
- The Adventures of Little Mariah
- The Adventures of Lou Merriwether, Psychopomp
- The Adventures of Merlin
- The Adventures of Professor Gamma
- The Adventures of Science Fiction
- The Adventures of the Bailey School Kids
- The Adventures of the Bailey School Kids Holiday Specials
- The Adventures of the Princess and Mr. Whiffle
- The Adventures of the Valiant Captain Ramos and Her Crew
- The Adventures of Tintin
- The Adventures of Tintin (Film Tie-ins)
- The Adventures of Treehorn
- The Adventure Zone
- The Adventure Zone Graphic Novels
- The Advocates
- The Ægypt Cycle
- The African Trilogy
- The Afterblight Chronicles
- The Agathas
- The Agency
- The Agency (Grey, Elizabeth)
- The Agents for Good
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