(3) 4-6 39 Clues: Cahills vs. Vespers series. Siblings Amy and Dan reach a breaking point when they discover the Vespers' fatal plan (Trust). In Doom, the two face the near-impossible task of destroying a Doomsday device and shutting down the Vespers indefinitely. The final two entries in this suspenseful series are more focused and deliberately paced than previous books, which helps bring the story to a satisfying conclusion. Review covers these 39 Clues: Cahills vs. Vespers titles: Day of Doom and Trust No One.

Reviewer: Lana Barnes

(4) 4-6 39 Clues: Cahills vs. Vespers series. Eager to save their kidnapped family members, siblings Dan (thirteen) and Amy (sixteen), continue to take orders from their enemy, Vesper One. Crisscrossing the world, the Cahills search for ancient artifacts, while dodging Interpol and the conniving Wyoming siblings from the clue hunt. The high-stakes (if formulaic) plot moves quickly and builds suspense, while historical facts are woven into the stories. Review covers these 39 Clues: Cahills vs. Vespers titles: The Dead of Night and A King's Ransom.

Reviewer: Lana Barnes

(3) 4-6 39 Clues: Cahills vs. Vespers series. Siblings Amy and Dan reach a breaking point when they discover the Vespers' fatal plan (Trust). In Doom, the two face the near-impossible task of destroying a Doomsday device and shutting down the Vespers indefinitely. The final two entries in this suspenseful series are more focused and deliberately paced than previous books, which helps bring the story to a satisfying conclusion. Review covers these 39 Clues: Cahills vs. Vespers titles: Day of Doom and Trust No One.

Reviewer: Lana Barnes

(4) 4-6 39 Clues: Cahills vs. Vespers series. In this fourth installment of the interactive series, siblings Amy, sixteen, and Dan, thirteen, continue to track down priceless treasures to ensure the safety of their family members being held hostage by the Vespers. The stakes are raised when one of the hostages is separated from the pack, but multiple side stories and characters cause the plot to lose focus.

Reviewer: Lana Barnes

(3) 4-6 39 Clues: Cahills vs. Vespers series. Vesper One, a centuries-old adversary, kidnaps seven members of the powerful Cahill family. Thirteen-year-old Dan and sixteen-year-old Amy, winners of the clue hunt from the first 39 Clues series, must steal a national treasure and deliver it to the Vespers in exchange for the hostages. The fast-paced, action-packed adventure gets this spin-off series started with a bang.

Reviewer: Lana Barnes

(4) 4-6 39 Clues: Cahills vs. Vespers series. Eager to save their kidnapped family members, siblings Dan (thirteen) and Amy (sixteen), continue to take orders from their enemy, Vesper One. Crisscrossing the world, the Cahills search for ancient artifacts, while dodging Interpol and the conniving Wyoming siblings from the clue hunt. The high-stakes (if formulaic) plot moves quickly and builds suspense, while historical facts are woven into the stories. Review covers these 39 Clues: Cahills vs. Vespers titles: The Dead of Night and A King's Ransom.

Reviewer: Lana Barnes