Books in the Defenders of Justice series

When U.S. Marshal Mercy Brennan is assigned to a joint task force with the St. Louis PD, she's forced back into contact with her father and into the sights of a notorious gang. Mercy's boss assigns her colleague--and ex-boyfriend--Mark to get her safely out of town. But when an ice storm hits and the enemy closes in, can backup reach them in time?

Four years ago, Kate O'Brien and her twin were attacked by a serial killer and only Kate survived. She's been in witness protection ever since her testimony led to a conviction. When new evidence is found suggesting they got the wrong man, Kate is terrified. With a target on her back, can U.S. Marshal Tony DeLuca keep her safe until the new trial begins?