Spy School: Little sister, big problems, giant future

It's been 5 months since the defeat of SPYDER. Ben and the gang are doing well in Spy School. No signs of any evil organizations anywhere. Everything is just fine.

Until Catherine and Alexander tell them that they are going to have another child.

The gang is shocked to hear the news. They try to keep it a secret, but of course it gets out. No secret can be kept forever in Spy School. Everyone is thrilled to see Catherine and Alexander's second child.

Except for one person.

Erica is doubtful about her new baby sister. She believes that the baby will only get in the way of things in the future. The gang tries to assure her that the baby will be just fine and that she won't need to worry about a thing.

But when a new mission comes into play, things get a little out of hand.

And as this is all happening, a new enemy arises from the shadows. Will the gang be able to stop the bad guys? Or will the mission be a failure?