Uncommon Bravery (Tinker/Knight Adventures Book 1)

The bugs have arrived and the invasion of Earth has begun. An intrepid group of friends will stop at nothing to defend their home.
A massive fleet of aliens arrived weeks back and have been battling it out with the combined fleets of mankind's most powerful nations. The war for humanity's very existence has begun and it's not going very well. With supremacy in orbit, the Kroerak empire has started the second phase of their invasion by sending in their armies.
Lester Knight, Jeremy Tinker and Clara Daws have grown up in the sleepy little town, Elm Bluff on the western border of Iowa. Nothing much exciting every happens in Elm Bluff until suddenly it becomes a buffer between two armies. The town has only one chance of survival and that's if it can be cut off from the bugs.