Che fine ha fatto Mister Y - The End Of Mr. Y, by Scarlett Thomas (2006, UK)

Ariel is a MSc student writing a thesis on mind experiments and ability to travel by thought.
She accidentally bumps into an ancient book, The End Of Mr. Y, by the author she's studying, Lumas: it's one of a kind and said to be cursed... and it leads Ariel to a vitally dangerous adventure that will completely change not only her life, but even her perspective on world, on time and place link ..and perhaps the all world.
Complex character and kind of philopsophically interesting novel, mind opening.