As We Peer Out from Under Our Rock

This story starts and ends in a small town in the mid-1950's where a large legendary ancient rock sits. It is about the adventures of an old man and a carefree, immature, sometimes mischievous set of brother and sister twins along with their two best friends.
It begins on the kid's high school graduation day. Pulled under a huge legendary rock, they find themselves trapped in a bizarre supernatural world. This tale is about their effort to get back to their world unharmed in spite of all the dangers they must face.
The journey is a spiritual one that only fantasy can explain. Whether you accept the premise or not, I hope you will enjoy the read.