Was it a split personality? Or was she possessed?

What started off a psychological thriller ended as a spooky paranormal piece of fiction that gave me the heebie-jeebies. Is a ghostly force at work? Or is it truly all in her head?
The bookie Monster

She had a look that immediately put everyone she met at ease. Small of stature, with grandmotherly eyes. By the time they discovered the evil lurking behind that innocent facade, it was too late.

All Margaret wanted was to serve her time for the crime she committed, get on with her life, and put everything that had happened in her past behind her. Unfortunately a new doctor takes over her case, and immediately changes her medication, allowing her alter ego, Candice, to escape from the prison she'd constructed in her mind.

Diagnosed at an early age with Dissociative Identity Disorder, also known as a split personality, Margaret had never known loneliness. All her life she shared her physical self with the dark half of a divided psyche, an evil twin known as Candice.

They were the two faces of the same coin, the Ying and the Yang, the good and the bad all rolled into one. While Margaret was the picture of innocence, Candice carried the face of absolute evil, and everywhere they went she left a bloody trail in her wake.

In a desperate bid to reclaim her life, Margaret, driven by Candice, escapes with a simple plan. Return home, take the place of her twin sister, and live out the rest of her life in relative peace. But even the best laid plans had their flaws, and not even Candice can escape one simple truth.

The ghosts of the dead always get their revenge.

Pretty creepy, well written, loved it!Amazon reviewer

Fun and solid read!Goodreads reviewer

Genre: Mystery

Used availability for Richard Schiver's Reprisal

Kindle Editions

December 2013 : USA, Australia, Canada, UK Kindle edition

Title: Reprisal: Vengeance knows no boundary
Author(s): Richard Schiver
Publisher: Abiss Books
Availability: Amazon   Amazon UK   Amazon CA   Amazon AU