Third-grade scientist and inventor extraordinaire Ada Lace is always looking for her next big project. Right now, she wants nothing more than to fix up an old ham radio. If she can get the complicated mechanics working, she might be able to communicate with people across the planet, or maybe even send a message out into deep space. The radio seems like a bust until a weekend sleepover changes everything. In the middle of the night, a strange and crackling voice comes through the radio speaker with a terrifying message telling them to release the swarm. Ada's best friend Nina is immediately convinced that extraterrestrials are hovering above Earth and preparing for an alien invasion. As the strange broadcasts continue, the two friends are thrust into a thrilling investigation to figure out exactly who, or what, is on the other end of the frequency. You will have to put on your detective hat and join the girls as they use logic, technology, and teamwork to decode the mysterious transmissions and find out if aliens have truly arrived.