An inexplicable mirage was materializing near the center of the room.
Some claimed they were drawn here by the powerful magnetic field that emanated inexplicably from these coordinates, some claimed they came to search the hillside for a hidden entrance to the vault, but most admitted they had come simply to wander the grounds and absorb the lore of the Holy Grail.
There are no more uses of "inexplicable" in the book.
Show samples from other sources
With that he turned away and once again started inexplicably walking toward the wall.
James Dashner -- The Scorch Trials
For some inexplicable reason, those words popped into Thomas’s mind.