This was a paperback series, late 90s/early 2000s would be when I read it. It’s about a town that experiences paranormal stuff, usually involving aliens or mad science experiments. (May have been a ‘Scholastic’ book/series).
The key details I remember are:
1) The book always had an illustration of the town. The town was pyramid-shaped and with a UFO either at its top, or near the center.
2) One of the main characters mother (maybe both parents) was a secret government agent and would work to contain the paranormal phenomena, though the story always focused around the kids, and the son of this/these agent(s) was always oblivious to what she/they actually did for a living.
Trying to name this book series has been driving me nuts, hope you can help!
Lost Classics of Teen Lit: Name That Book! 