First Mentor by Lucas Flint

After the events of "First Magic," Alex Fry (Beams) heads out to a small town in West Texas to train under Rubberman's mentor, one of the first ever superheroes. Beams finds his mentor's training a bit unusual, but he expects nothing interesting to happen while out there.

When aliens suddenly start abducting cows from local ranches, however, Beams finds himself thrown into a web of intrigue, government agents, and secrets related to the origin of Rubberman himself.

And unless Beams is able to find out what the aliens want quickly, he won't be able to stop their sinister plan.