A 2006 novel by Spider Robinson. Russell Walker is a political columnist for a Canadian newspaper. He is inadvertently dragged into the hunt for a serial killer when an old friend who happens to be a telepath shows up at his door one night.
This book provides examples of:
Battle in the Center of the Mind: How Zandor finally kills Allen. Despite only involving one telepath, it was a real battle, as Alan's vile thoughts are so evil as to be weaponized. Zandor considered this a last resort, because he had sworn he would never do so . . . again.
Coldblooded Torture: Allen's repertoire includes drugs to enhance pain, drugs to prevent his victims from passing out, a perfect painkiller that lets him break every bone in someone's body then allows them to contemplate the excruciating pain they're about to experience.
A Mind Is a Terrible Thing to Read: Zander, the telepath, finds close proximity to almost anyone distinctly uncomfortable. When he finally comes in close contact with Allen, this becomes a distinct disadvantage. Merely being close to a mind that viciously demented is torture for him.