Last Kids on Earth Series by Max Brallier

Ever since the monster apocalypse hit town, average thirteen year old Jack Sullivan has been living in his tree house, which he's armed to the teeth with catapults and a moat, not to mention video games and an endless supply of Oreos and Mountain Dew scavenged from abandoned stores. But Jack alone is no match for the hoards of Zombies and Winged Wretches and Vine Thingies, and especially not for the eerily intelligent monster known only as Blarg... moreEver since the monster apocalypse hit town, average thirteen year old Jack Sullivan has been living in his tree house, which he's armed to the teeth with catapults and a moat, not to mention video games and an endless supply of Oreos and Mountain Dew scavenged from abandoned stores. But Jack alone is no match for the hoards of Zombies and Winged Wretches and Vine Thingies, and especially not for the eerily intelligent monster known only as Blarg. So Jack builds a team: his dorky best friend, Quint; the reformed middle school bully, Dirk; Jack's loyal pet monster, Rover; and Jack's crush, June. With their help, Jack is going to slay Blarg, achieve the ultimate Feat of Apocalyptic Success, and be average no longer!  Can he do it? less

The zombies are disappearing. This might seem like a good thing, since zombies eat your brains, but normal human kid Jack Sullivan is suspicious. He keeps hearing an eerie shrieking noise that seems to be almost summoning the zombies—but to where, and for what (probably) foul purpose? Jack, his three best friends (maybe the only people left on Earth), and their pet monster Rover need to get to the bottom of this... moreThe zombies are disappearing. This might seem like a good thing, since zombies eat your brains, but normal human kid Jack Sullivan is suspicious. He keeps hearing an eerie shrieking noise that seems to be almost summoning the zombies—but to where, and for what (probably) foul purpose? Jack, his three best friends (maybe the only people left on Earth), and their pet monster Rover need to get to the bottom of this. Along the way they encounter a lot more than they bargained for, including a giant Wormungulous, a pizza parlor monster hangout, an ancient evil who destroys worlds, and a stereo system that is totally the bomb. Can Jack figure out why the zombies are vanishing . . . before he and his friends are next? less

The newest installment in this New York Times bestselling series introduces new monsters, new bad guys, and tons of new laughs! It's the first winter after the Monster Apocalypse. For Jack and his buddies, that means sled catapults, epic snowball battles, and one monstrous Christmas celebration. But their winter wonderland turns dark when a villainess begins hunting them. And this villainess is different — she’s a human... moreThe newest installment in this New York Times bestselling series introduces new monsters, new bad guys, and tons of new laughs! It's the first winter after the Monster Apocalypse. For Jack and his buddies, that means sled catapults, epic snowball battles, and one monstrous Christmas celebration. But their winter wonderland turns dark when a villainess begins hunting them. And this villainess is different — she’s a human. When the villainess steals Jack's prized monster-slaying tool, the Louisville Slicer, he vows to get it back. But it won’t be easy. Jack and his friends soon discover that the Louisville Slicer is the key to a dark plan that threatens the entire world — and beyond. .. less