Chelsea had never seen her little brother Mike so terrified. But soon she was pretty scared herself. Their new friend Colin had told them aliens were going to invade Earth and make everybody their slaves--and he showed them the proof!

As if that weren't enough to worry about, Chelsea also had to find out whether the valentine she'd received from a secret admirer had come from Brody or not--and if she dared to give him one back. But if the aliens were coming, what would any of that matter anyway?

In this Best Friends book, Chelsea, Kathy, Roxie, and Hannah--that fun-loving foursome whose popularity is growing every day--fall into new zany adventures that will intrigue readers page after page. An action-packed, can't-put-it-down adventure that will show 9- to 12-year-olds the true meaning of courage and trust.