Digit's cousin, Brigit, is in a prickly bind. Although her garden is overflowing with flowering cactus plants, they're not bearing any apple cactus fruit. And no cactus apple fruit means no cactus apple juice--everyone's favorite drink in all of Cyberspace! Brigit thinks she knows what's going on, thanks to a chart she's kept of how many bats--or in this case, how few--have come to pollinate the cactus flowers so far. Where have all the bats gone? Could it have something to do with Hacker's new secret hideout? With a map to guide the way, Digit, Matt, Jackie, and Inez set out into the desert to find out.