2015’s The Thing Itself is a standalone novel by Adam Roberts.
Perhaps in another trouser-leg of time, Charles Gardner’s Antarctic sojourn with fellow researcher Roy Curtius ended with professional accolades all round. In the timeline related in this novel, Gardner and Curtius not only failed to provide the world with tangible evidence of SETI, but Curtius went mad and Gardner only narrowly survived the murder attempt that followed.
A traumatized and scarred Gardner spent the next few decades tumbling down the ladder of British society, only coming to rest when there was nowhere else to fall. Obscurity and an unremarked death seemed all that was left to the alcoholic, abrasive former scientist.
The researchers at an obscure Institute are convinced that Curtius holds the key to their ambitious research. They believe that Gardner can provide them with the leverage to render Curtius, long consigned to an institution for the criminally insane, tractable. Why bother? They are sure that Curtius holds the key to understanding the true reality behind the reality we perceive.