Still recuperating from her evil-genius little sisters last experiment, eleven-year-old Masha (Sunny Sweet Is So Not Sorry) unknowingly becomes the subject of Sunny's latest, which involves red dye, falling into a grave, and public humiliation. Mann shrouds a lesson about accepting differences in over-the-top humor; fans of the unrelenting absurdity, enlivened in sweet black-and-white drawings, will hanker for the next experiment.

More adventures of genius Sunny Sweet and her loving but frustrated big sister, Masha, who is clearly tired of her little sister knowing more than her. Given that Sunny Sweet Is So Not Sorry (2013) landed both girls in the hospital, readers might think that their single mother would understand how careful she needs to be about sending her daughters off unsupervised. No. The two girls are dropped off for a science fair. Sunny soon tosses red dye on Masha and reveals her true plan: It's a social experiment about being different, and Masha is the subject. Soon Masha is breaking into art classrooms, running away on a city bus, arguing with Sunny, picking up a maggot-encrusted hamburger and falling into an open grave. Turns out that Sunny is filming all these adventures from a camera hidden in her hat and sending the feed to the science fair. To enjoy these adventures, readers need to suspend any sense of reality: How many 6-year-olds, geniuses or not, have smartphones? How long would real teachers watching the movie feed wait before intervening? The slapstick escalates to thoroughly ludicrous proportions. The final chapter appears to be a confusing introduction to the next unbelievable episode in these girls' lives rather than a resolution to this one. Over the stinkin' top, as Masha might say. (Fiction. 8-12)