While not technically a sequel to Forget Me Not, two minor characters in that novel take the lead in Deadly Ties. One should read Forget Me Not before this one.
Mark Taylor is a former Special Operative and is now providing security for a couple threatened by a mafia type group. He falls in love with Dr. Lisa Harper, who has repressed the memories of her childhood abduction. She has been forbidden by the mean second husband of her mother to have any contact with her mother. Lisa, now with the financial means, plans to remove her mother from the abusive marriage.
Mark feels compelled to protect Lisa and her mother but his efforts are all to lame. The mother is beaten nearly to death while walking to the party celebrating Lisa's becoming a doctor. At the time of the attack, Mark and Lisa have a eyes only for each other. (This was the first of what I considered many unrealistic scenes in the book.) When Lisa visits her comatose mother in the hospital, she is abducted. (That Mark is in the hospital, and his old team of special ops people are with him, yet he does not protect Lisa, was the second unrealistic scene in the book.)
Lisa has been abducted by the mafia type group at the request of the evil stepfather. She, along with other women abducted for a price, are on their way to Mexico where they will be sold. Even though Lisa leads classes in self defense she remains virtually defenseless (more unrealistic aspects of the novel).
Publisher information: http://waterbrookmultnomah.com/catalog.php?isbn=9781601422064