Margaret Millar’s The Listening Walls (1959; 2016)
Buried In Print2017-03-06T16:21:14-05:00Although some of the characters in the Margaret Millar mysteries I have read answer their own phones, many answer other people's phones instead: the telephones of older or more privileged relatives or those of their bosses. There's even a switchboard operator in the mix, along with a woman better known