I'm gonna lump both of these reviews together, because the story continues from book 2 to book 3, and frankly I don't feel like writing two separate reviews.
Rise of the Elgen starts out with Michael and his friends driving back to Idaho from the Elgen academy in California. When they get home they find that their families are either gone or under surveillance by the Elgen. So they crash at a friend's house while they're going through information they found at the Elgen academy. Within this information they out that Michael's mother is being held at a facility in Peru. With the assistance of a mysterious organization, Michael and his friends fly to Peru to rescue his mother and, if possible, shutdown the Elgen facility.
***Spoilers for book 2 below***