Aerie Walker should be famous or dead or both by now, just like her deceased idol Scott LaFaro of the Bill Evans Trio. She plays upright bass, and plays it very well. Won awards and acclaim, but could never manage a living. Her odyssey in professional jazz ends with spoiled dreams and a failed suicide attempt in Tokyo. She retreats to Ithaca, NY where she hopes to pursue a new career in the culinary arts.
One night after work, a 'musicians wanted' posting intrigues her. She hauls her bass out of storage to a bizarre jam session in the wilds of Connecticut Hill. She joins this odd ensemble, playing atonal, improvised music for a mysterious bell jar, but never in public. Musical alchemy, patron Aaron Levine calls it. The thing in the jar does interesting things to carbon when the right sort of dissonance sends it resonating.
This 'music' appalls John and Cindy, the God-fearing couple who live next door. The hellish racket seems to draw the oddest creatures out of the forest. Might they be demons? Pastor Mac, her illicit lover, agrees to intervene, cashing in a favor from an old friend who runs Last Hope Ministries, a commando deliverance outfit specializing in high tech, large caliber exorcisms.
When Aaron goes away on business, the band, pining for recognition, brings the show to town, bell jar and all. The gig proves disastrous, freeing the entity in the bell jar, wreaking havoc on the alchemist's designs and nipping Aerie's musical comeback in the bud.
But cuckold John becomes a fan, accomplice and secret admirer of Aerie. Can he jam the gears of the potentially deadly deliverance intervention in time?