Ms Fraser takes her readers to Tacoma and its surroundings in the northwest, an area polluted by the smelting industry for decades. With lead and arsenic among the main components of the deadly emissions released by smelter smokestacks, and leaded gasoline further increasing atmospheric lead levels, there was little chance for locals in the region to escape the toxic effects of these fumes. The people, and especially children, grew on a steady diet of lead and arsenic, and Ms Fraser traces a connection between the presence of high levels of such elements in human beings with severe mental development issues, ranging from irritability to “dreams bordering on hallucinations”. Studies are beginning to link childhood lead exposure with “aggression, psychopathy and crime,” she writes. Fascinatingly, all the serial killers she talks about in Murderland, such as Ted Bundy, Warren Leslie Forest, Dennis Rader, Richard Ramirez and Israel Keyes (whose ideal was Ted Bundy) spent years living in and around places with high lead concentration in the air.