Stink may be a super science freak, but even Dr. Stinkelstein is feeling freaked out about having a slime mold living and growing in his very own room. At Saturday Science Club, Stink learns that these one-celled organisms are smart enough to find their way out of mazes and gang up on food sources.

"It's the summer of 2015, Brooklyn. The city is sweltering from another record-breaking heat wave, this one accompanied by biblical rains. Edith, a recently retired legal librarian, and her identical twin sister, Kat, a feckless romantic who's mistaken her own eccentricity for originality, discover something ominous in their hall closet: it seems to be phosphorescent, it's a mushroom . . . and it's sprouting from their wall. Upstairs, their landlady,...

When his new best friend, Ben, decides to run for class president, fourth-grade science whiz Phineas MacGuire reluctantly agrees to be his campaign manager in exchange for help with his latest experiment--cultivating exhibits for a mold museum.