Digit’s cousin, Brigit, is in a prickly bind. Although her garden is overflowing with flowering cactusplants, they’re not bearing any apple cactus fruit. No cactus apple fruit means no cactus apple juice. Brigit thinks she knows what’s going on thanks to a chart she’s kept of how many bats 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. Part of the "Cyberchase" series.