ALA Booklist (Mon Feb 01 00:00:00 CST 2016)

Delphine Cooper is the only member of her sixth-grade class who seems to notice Nate Bannister, a genius with too much intellect and not enough social skills. On each Friday the thirteenth, he schedules himself to do three foolish things, and this time around, he has enlarged his mother's cat beyond all reasonable size. And turned said cat invisible. And, as he and Delphine try to control the giant invisible cat, he also lets loose the news that there is an international crime syndicate, the Red Death Tea Society, that is trying to destroy him d now Delphine, too. Delphine's motor-mouthed narration carries readers along as she tries to keep up with Nate and the rapidly evolving absurd disasters he perpetrates in the name of science. What she doesn't know about science, she makes up for by being his friend and helping him experience life beyond the predictability of equations and probability. This odd couple proves that teamwork works, and news of a sequel will likely be met with applause.

Horn Book (Sat Apr 01 00:00:00 CDT 2017)

Sixth graders Nate, a genius inventor, and Delphine, his new friend must deal with one of Nate's tricks gone wrong (super-sizing his cat Proton) while also foiling the evil Red Death Tea Society. The pair's developing friendship adds a sweet undercurrent, and Delphine's wry narrative voice ratchets up the humor in this gadget-filled series-opener; occasional spot art included.

School Library Journal (Tue Dec 01 00:00:00 CST 2015)

Gr 3-6 In this quick and fun series starter, Tobin uses humor and great imagination to offer younger middle grade readers a delightful romp that will appeal to fans of madcap adventure. Genius inventor Nate and his best friend, Delphine, find themselves in a bit of a pickle on Friday the 13th, when Nate turns his pet cat invisibleand gigantic. Events escalate with the additions of a talking Scottie dog and an evil "Red Death Tea Society." Nate is a lovable underdog and nerd, while Delphine faces issues with friendship and social interactionsthemes that will resonate with kids. VERDICT Ideal for book clubs. The easy flow of dialogue and vocabulary will help build fluency and keep readers' attention. Tracey Wong, P.S. 54/Fordham Bedford Academy, Bronx, NY