The Reality Dysfunction.
Written by Peter F. Hamilton. Narrated by John Lee.
Absolutely immersing literature never mind that the deadtree version is thick as a Washington DC phone book. The characters are developed and you feel what they feel. The first breaking into the Beyond occurs because an Involuntary Transport (IVET) named Quinn Dexter conducts a Satanic ritual on a stage 1 colony planet called Lalonde. The ritual doesn’t cause it so much as something else, something curious, something alien with enough energy to hold the door open to the insane souls scrambling through to possess living humans.
Read this then listened to it on audible. Out standing. Five by Five for storytelling, and delivery.