Forever Alexa (Book Four In the Bodyguards of L.A. County Series)

The one man who broke her is the only man who can save her...
First-grade teacher and single mother Alexa Harris is no stranger to struggle, but for once, things are looking up. The school year is over, and the lazy days of summer are here. Mini-vacations and relaxing twilight barbeques are on the horizon until Alexa's free-spirited younger sister vanishes.
Ransom calls and death threats force Alexa and her young daughter to flee their quiet home in Maryland. With nowhere else to turn, Alexa seeks the help of Jackson Matthews, Ethan Cooke Security's Risk Assessment Specialist, and the man who broke her heart.
With few leads to follow and Abby's case going cold, Alexa must confess a shocking secret if she and Jackson have any hope of saving her sister from a hell neither could have imagined.