In response to a dare, Mona, Charley, Lily, and Fang venture out on a night-time mission. Their goal to retrieve the hat of the Living Scarecrow, the nefarious straw entity that haunts the local graveyard. It's a ghoulish tale of unbridled evil, stamp club meetings, and wayward zombies. / When Mona's parents go out for the night, the new babysitter comes over. But there is something unsettlingly different about Belinda. Enlisting the help of her friends, Mona uncovers conclusive proof that her babysitter is...a robot! And worse still, a robot programmed by her most hated rival Angela Smith!

Charley breaks the ultimate taboo and leaves Mona's favorite comic book, Von Kreepsula 1, out in the rain. To Mona's horror, when the water makes the ink run, the evil Von Kreepsula is freed from his comic book prison and is soon stalking Mona's town. Mona and Charley must face down Von Kreepsula on his own turf - within the comic book realm - if they have any hope of beating the vampire king. / Charley buys himself a hot new computer game, Starclangers IV and becomes so involved in the game, it takes over his life. He's inside day and night, he's always late for class, and he has suddenly adopted a permanent, glassy expression. As more and more kids in town fall under the strange spell, Mona discovers that the game possesses a virus capable of infecting hard drives - no, not computer hard drives, BRAINS! With the help of a scanner and some liquid anti-virus disks, Mona, Lily, and Fang enter the computer world to put an end to the vicious virus.

Hair-raising night-time howling. The mysterious disappearance of Mrs. Bryerson's poodle. What's going on? The clues all point to none other than the Phantom Dog Catcher! Using an undercover Fang as bait, Mona and Lily follow the dog soul-stealing villain to his lair - the astral dog kennel - for an ultimate showdown. / It's the annual science fair and Mona has pulled out all the stops. Armed with a dino D.N.A. amber tree sap sample, a papier mache exo-skeleton, and a gene-splicing recipe she found in the back of a comic book, Mona creates...a Frankensteinorsaurus! By all rights she should be the hands down winner at the science fair! That is, if and only if, she can recapture the giant lizardly beast before it destroys the town.

Socks, shoes, vampire towels and other miscellaneous objects are vanishing, disappearing, as if vanishing into some void. Someone or something is stomping through town, taking things that don't belong to them and leaving other odd objects in their place. Could the Whirling Void be behind the reign of terror, snatching and destroying at will, leaving a path of confusion and devastation in it's wake? Or, might the answer quite simply lie in Mr. Tuckerfield's new prescription glasses? / Garden gnomes are vanishing from front yards all over town and many townspeople suspect juvenile pranksters at work. But Mona's investigation uncovers something far more insidious behind the strange disappearances - namely a rabble of very animated, very real gnomes.

The town is in the grips of an insect invasion and no one knows where to turn for answers. A little footwork leads Mona and Charley to Herb Crofton, a visiting entomologist, who may or may not be a bug himself. But when Mona and Charley try to zap Herb down to size with Zapman's Zapperamma incredible shrinking ray gun, a stray shot glances off a mirror and zaps THEM INSTEAD! Suddenly, Mona and Charley find themselves trapped in an oversized, creepy, very crawly world. / St. Faith's is holding a fashion show. All the kids are to design their own clothing and have it judged by world class super model Tiffany S. Tyk. Of course, Mona is far too busy trying to save the town from the arrival of the Living Mannequin, whom she's already spotted lurking around the Non-fat Simulated Yogurt Parlor. The world of high stakes glamour competitions and catwalks inevitably comes crashing down when Mona inadvertently finds herself a reluctant finalist in the self-designed costume competition.

Mona and Charley beam a message via satellite to extraterrestrials across the universe - and, the very next day, an exchange student suddenly shows up at school. Coincidence? Hardly. Mona suspects that Cedric is, in reality, a cleverly disguised alien there on an advance scouting mission. To make matters worse, it turns out that the "x-change student" will be staying at her place for the week. / Mona's attempts to ward off an imminent invasion by red moon monsters are stymied by the new next-door-neighbor - a shy, introverted girl named Lily Duncan whom she is forced to entertain for the evening. But before night's end, the reserved Lily does a one eighty turn around. With Mona's help, she transforms into the lively Princess Giant, thwarts the red moon monsters, and discovers a spirited part of herself she never knew existed.