Night Fall by Nancy Mehl

 Now that Alexandra "Alex" Donovan is finally free of her troubled upbringing, she's able to live out her childhood dream of working for the FBI. But soon after she becomes a member of the FBI's elite Behavioral Analysis Unit, authorities in Kansas and Missouri contact them about bodies found on freight trains traveling across the country--all killed in the same way.

Alex never expected to be forced to confront her past in this new job, but she immediately recognizes the graffiti messages the killer is leaving on the train cars. When the BAU sends her to gather information about the messages from her aunt in Wichita, Kansas, Alex is haunted by the struggles she thought she'd left behind forever.

In a race against time to solve the case while battling her own weaknesses, Alex must face how far she'll go--and what she's willing to risk--to put a stop to the Train Killer.

Alex has to face old fears and a traumatic childhood as she is sent to Wichita to help catch a serial murderer.  Along the way she discovers that not only is he a serial murderer but he is planning on releasing a deadly toxin that could wipe put a third of the world’s population.  Along with Alex is another Logan another Behavior Analyst with the FBI.  She finds herself revealing more of her childhood to him than she has to anyone else.  While in Wichita the things she has tried to forget resurface. As she struggles to overcome her past, time is running out to catch the terrorist.

I recommend this book to all mystery fans.  I was given this book by Bethany House Publishing via NetGalley in exchange for an honest review.  I was not compensated in any way.