| 100% | SON | 3 | "The ___ of Neptune" (second book in Rick Riordan's "Heroes of Olympus" series) |
| 49% | HERO | 4 | "The Lost ___" (first book in a Rick Riordan fantasy series) |
| 48% | GATHERINGBLUE | 13 | Second book in 16-Across's "The Giver" series (2 wds.) |
| 48% | NATE | 4 | ___ the Great (detective in a series of children's books) |
| 47% | ABANDONED | 9 | Deserted, and the title of the second novel in 27-Across's "Donovan" series |
| 47% | RIDDLER | 7 | The —, alter ego of villain Edward Nigma in DC’s Batman comic book series |
| 47% | BABAR | 5 | King of the elephants in a children's book series |
| 47% | BABAR | 5 | "King of the elephants" in a series of children's books |
| 46% | THEROGUECREW | 12 | Last book in the "Redwall" series of children's fantasy novels by 50-Across (3 wds.) |
| 46% | CALLA | 5 | Stephen King's fifth book in his The Dark Tower series: "Wolves of the ___" |
| 46% | STARSIGHT | 9 | Second book in the 10-Across series by 24-Across/40-Across |
| 46% | TWO | 3 | "The ___ Towers," second book in "The Lord of the Rings" trilogy |
| 46% | STEVESAX | 8 | Second baseman in both of the Dodgers' 1980s World Series |
| 45% | PERCY | 5 | Jackson in a Rick Riordan book series |
| 45% | GOT | 3 | First book in the series "A Song of Ice and Fire," familiarly |
| 44% | AGE | 3 | "___ of Reptiles," Ricardo Delgado's comic book series which is set in the Mesozoic era |
| 44% | AISFORALIBI | 11 | Title of the first book in the 17-Across series |
| 44% | PRINCE | 6 | "___ Caspian: The Return to Narnia," second novel in the fantasy series "The Chronicles of Narnia" by C.S. Lewis |
| 44% | RIORDAN | 7 | Rick, writer of the Percy Jackson book series |
| 43% | GHOUL | 5 | "The ___ Next Door" (second book in Lisi Harrison's "Monster High" series) |
| 43% | ASLAN | 5 | Lion in The Chronicles of Narnia series by C S Lewis |
| 42% | THELAST | 7 | & 17D 1956 novel in The Chronicles of Narnia series by C S Lewis |
| 42% | JKROWLING | 9 | Author of the best-selling book series in history |
| 42% | HARDKNOCKLIFE | 13 | Subtitle of the second album in a three-part semiautobiographical series by 39-Across (3 wds.) |
| 42% | WIMPY | 5 | Meek, as in the title of a "Diary" series of kids' books |
| 42% | JANEGOODALL | 11 | Writer whose second book about chimpanzees, "In the Shadow of Man," was published in 1971 (2 wds.) |
| 41% | CHAMBER | 7 | "Harry Potter and the ___ of Secrets," the second instalment in the "Harry Potter" film series |
| 41% | SNOWY | 5 | English name of Milou, white fox terrier in The Adventures of Tintin comic book series |
| 41% | LANG | 4 | Lana —, high school girlfriend of Clark Kent in the Superman comic book series |