Thayer, Ella Cheever.: Wired Love A Romance of Dots and Dashes. v1, 20 Jan 2008
 

From the Boston Globe:

Nattie and Clem, who work in separate offices of the same company, strike up a banter that becomes flirtatious.
Between deadlines, they tease each other, laugh at the misunderstandings that result from their virtual friendship - and wonder uneasily what the other is really like. But when they meet, they're so tongue-tied that they quickly go back to their faceless chatter.
Sound familiar? Nattie and Clem could be your cubicle neighbors. But they are fictional telegraph operators, communicating via Morse code in the startlingly powerful novel, ''Wired Love.'' The author, Ella Cheever Thayer, was a Boston telegraph operator who long ago understood the pros and cons of the electronic relations we've grown to depend on.