Cabot stated that she originally planned the series as an eight-book arc, but because of poor sales only got the chance to write six.
The series follows along with a girl named Susannah "Suze" Simon and her experiences as a teenage mediator - a person who has abilities to see, touch and talk to ghosts, and main goal is to help them to the "Great Beyond" (after life).
Since he is an undead, no one other than Suze and some other mediators (Paul, Father Dominic, Dr Slaski and Jack there was also a little boy at her job) can see him.
Jesse's rival is a fellow mediator, Paul, who Suze calls "The Spawn of Satan" and she does not express any feelings for him.
In a 2020 blog, Cabot confirmed that American-Australian writer and director Sarah Spillane had shown her a script of a possible adaptation of Shadowland.