Foreign Shadows: The Persuader (Book 3‪)‬

This creature takes on the form of the innocent but is far from that. It is a playful disobedient child-like creature that enjoys playing games. It is the only one of its kind that will allow you to see it until you have embraced it. Once you welcome it into your life you are unable to see what it is up to, but you can hear it whisper lies into your ear and convince you to do the unimaginable.
Rebecca unknowingly gives this creature the upper hand and allows it to enter her world. Soon her thoughts are not always her own and what is hers are not good feeding into the Persuaders thrill.