The Fan

Read in print. Spoilers are here.
This is a weird book. Very much of its time, I think. It is an epistolary novel & I love epistolary novels. It does pretty well at keeping the reader's understanding of the situation limited by what is said in the letters but, on the other hand, broader than the understanding of any of the individuals.
I've been reading way too many junk romances so I was a little shocked when this book didn't stick to the formula.

Bawdy and aging Broadway star Sally Ross and her tough secretary, Belle, who cling together against the realities of lost loves and life passing, enter a world of bizarre terror when a persistent fan's letters turn perverse, obscene... and menacing.

Told in the form of letters of correspondence (1970's--would be emails & texts today). Read it in one sitting--somewhat predictable but still, the format made it intriguing reading.

This modest novel transpires as a series of letters, messages and other various documents. In its way it succeeds in building a surprising amount of suspense, even terror, as the reader sees a series of seemingly inconsequential acts build until a terrible situation is created, out of control, before anyone even realizes what or how it happened.
A motion picture was made from this; unfortunately it failed to deliver the focuses intensity the book conveys.