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From Publishers Weekly

Starred Review. Built around a ripe conceit—wealthy matriarch scatters cryptic clues to a mysterious fortune around the globe—this first installment in a projected 10-book series is tons of fun. Lead-off hitter Riordan (_The Lightning Thief_) mixes just the right proportions of suspense, peril and puzzles in a fast-paced read (Riordan mapped the narrative arc for all 10 volumes, but other high-profile authors will be writing for the series, too). Likable orphans Amy and Dan Cahill have moxie (plus Dan can memorize numbers instantly) and frailties (Amy hates crowds). As the siblings compete with less honorable members of the Cahill clan, all distantly related to Benjamin Franklin, to win the fortune by collecting all 39 clues (only two are found in this first book), they learn about their dead parents, each other and world history. The humor is spot on—one uncle is credited with inventing the microwave burrito. The only flaw? The story does not end so much as drop off a cliff. (The second book, One False Note by Gordon Korman, is set to arrive in December.) While waiting, readers can collect cards, each of which contains evidence, and play the online game (www.the39clues.com), for which Scholastic is offering over $100,000 in prizes. This ought to have as much appeal to parents as it does to kids—it's Webkinz without the stuffed animals, and a rollicking good read. Ages 9–12. (Sept.)
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From School Library Journal

Starred Review. Grade 4–7—When their beloved Aunt Grace dies, Dan, 11, and Amy, 14—along with other Cahill descendants—are faced with an unusual choice: inherit one million dollars or participate in a perilous treasure hunt. Cahills have determined the course of history for centuries, and this quest's outcome will bring the victors untoward power and affect all of humankind. Against the wishes of nasty Aunt Beatrice, their reluctant guardian since their parents' deaths, Dan and Amy accept the challenge, convincing their college-age au pair to serve as designated adult. Pitted against other Cahill teams, who will stop at nothing to win, the siblings decipher the first of 39 clues and are soon hot on the historical trail of family member Ben Franklin to unearth the next secret. Adeptly incorporating a genuine kids' perspective, the narrative unfolds like a boulder rolling downhill and keeps readers glued to the pages. As the siblings work together to solve puzzles and survive dangers, they develop into well-drawn individuals with their own strengths and personalities. Supporting Cahill cast members come across as intentionally exaggerated caricatures, adding to the tale's breathless fun. The book dazzles with suspense, plot twists, and snappy humor, but the real treasure may very well be the historical tidbits buried in the story. Part of a multimedia launch including a Web site, collectable game cards, and a 10-title series (penned by different authors), this novel stands solidly on its own feet and will satisfy while whetting appetites for more.—_Joy Fleishhacker, School Library Journal_
Copyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.