Virtual Vandals — Steve Perry

In the future, computers rule the world. The Net Force was formed to protect America from any and all criminal activity on-line. But there is a group of teenage whiz kids who sometimes know more about computers than their adult superiors. They are the Net Force Explorers. They go where no one else can go. And they fight crime like no one else in the world...

At a holographic "old-timers'"-- baseball game, Matt Hunter and several other Net Force Explorers are thrilled to see Babe Ruth swing for the fences. But when Ruth does his famous routine of pointing to the stands, four people dressed in 30s'-style outfits stand up and open fire with Tommy guns!

Even virtual bullets can kill you. Matt and his friends know that these "virtual vandals" must be stopped. But the stadium stunt is just the beginning. And even the teens of the Net Force might not be able to stop them next time!