Christmas at Silverberry Hall by Lucy Coleman

Jack Ashrin is the son of Malachi Adler, one of the most prolific criminal masterminds in the world.
His rules were clear: get an assignment, get it done, move on.
That was until a manilla envelope from an anonymous source fell on Malachi’s desk with a new name.
No details.
No reason.
Just a name.
It should have been easy, but when Jack found out the truth about his new target, his interest grew.
Suddenly, there was mystery, intrigue, and murder. How could he resist?

Rae Bennett lost her mother 8 months ago, and a man claiming to be her half brother showed up at her mother’s memorial a week later claiming he wanted a relationship only to try and take total control of her life.
Obsessed with anything that gives her a thrill, she and her friends head to a Halloween Carnival where she finds herself followed and cornered by a stranger in a mask, no help in sight.
Will she run? Or give in to her deepest darkest desires just for one night?

He was supposed to kill her.
She was supposed to be terrified.
Both are falling into a dangerous game neither will escape.