The Invisible Girl in Room Thirteen - Stephen Simpson
The Invisible Girl in Room Thirteen is one of those stories where you have to read between the lines, and I have left lots of breadcrumbs along the way toward the gasp! and twisty ending.
The first edition was published as The Girl in Room Thirteen, and as with all my questionable decisions to date, was later re-published as The Invisible Girl in Room Thirteen. Which, truth be told, is a more fitting title.
Read the first chapters at Stephen Simpson - The Invisible Girl In Room Thirteen