[This was previously published as The Time Device, but I got sick of that.]
Description: A fit of rage sends Bill down a spiral into strange religions, madness, drugs, and a narrow escape from death. A kind hypnotist brings him back from the edge and sets him on a quest to heal the ache in his soul. Along the way he discovers a device that enables him to travel through time and fix the fateful night when he lost the love of his life. But time travel is never that simple, and his several attempts to fix the past land him in the middle of a conspiracy of galactic significance.
Not free any longer, but you can get it here.