Operation Terror by Murray Leinster - Audiobook

Operation Terror, by Murray Leinster.
Read by Mark Nelson.

An unidentified space ship lands in a Colorado lake. Equipped with a paralyzing ray weapon, the creatures begin taking human prisoners. A lone land surveyor and a journalist are trapped inside the Army cordon, which is helpless against the mysterious enemy. Can they stop the aliens before it is too late? (Summary by Mark Nelson)