Daredevil by Mark Waid, Volume 4

Collects Daredevil (2011) #16-21. Someone is meddling with Matt Murdock's mind! Daredevil undergoes urgent brain surgery when fellow Avenger Hank Pym enters his head to destroy sensory-deprivation robots implanted by Dr. Doom. The two men gain a new understanding of each other's struggles when the bots battle back, forcing Pym to fight blind! Then, Daredevil's recovery hits a snag when he starts to question reality. His best friend, Foggy Nelson — believing Matt is losing his mind and presents a danger to himself and others — dissolves their law partnership and friendship. Ghosts from Daredevil's past return to haunt him in a mind-bending adventure that leaves him second-guessing his sanity as he faces off against dangerous new villain the Coyote!