Undercover Threat
By Sharon Dunn (Love Inspired Suspense)
Release date: May 5, 2020
From a dangerous reunion at sea…To undercover as husband and wife. Forced to jump ship during her investigation, undercover DEA agent Grace Young’s rescued from criminals and raging waters by her ex-husband, Coast Guard swimmer Dakota Young. Now to save the mission, Grace and Dakota must pose as a married couple to take down a drug ring. But will facing danger together reunite two broken hearts—or place targets on both of their backs?
Undercover Twin (Twins Separated at Birth)
By Heather Woodhaven (Love Inspired Suspense)
Release date: September 3, 2019
A deadly identity swap…The first exciting Twins Separated at Birth novelAudrey Clark never knew she was a twin—until she stumbled onto a covert operation. Now with her FBI agent sister shot and in critical condition, going undercover with Agent Lee Benson is the only way to protect her newfound twin. And as her pretend husband, Lee must keep Audrey safe…or pay twice the deadly price.
Undercurrent (Love Inspired Suspense)
By Sara K. Parker (Love Inspired Suspense)
Release date: January 6, 2015
TRAPPED AT SEA In an instant Kathryn Brooks’s idyllic transatlantic cruise turns to terror. It’s hard to believe someone has it out for her, yet chandeliers don’t explode on their own—and her best friend has gone missing. But Secret Service agent Sam West vows to protect her as every corridor poses a threat and any stranger may be an assailant. With the ship’s security providing little assistance, Kathryn puts her trust in Sam. Yet losing her own life is no longer her only fear.

Undetected
By Dee Henderson (Bethany House Publishers)
Release date: April 29, 2014
When asked what he does for a living . . . Commander Mark Bishop is deliberately low-key: “I’m in the Navy. ” But commanding the ballistic missile submarine USS Nevada, keeping her crew trained and alert during ninety-day submerged patrols, and being prepared to launch weapons on valid presidential orders, carries a burden of command like few other jobs in the military.
Uneven Exchange
By S.K. Derban (Limitless Publishing LLC)
Release date: September 1, 2015
Like fire and ice, Alexandra Callet’s life runs hot and cold. At the age of thirty-three, Alexandra owns a stunning home and a successful interior design company. But she is in love with her business partner, Jake Taylor, and he doesn’t even seem to realize she’s a woman. She should be on top of the world, but instead she feels dragged down by the void in her heart. Hoping for answers, she decides a trip to Mexico might soothe her soul.

Unforeseeable (Road to Kingdom) (Volume 3)
By Nancy Mehl (Bethany House Publishers)
Release date: September 1, 2013
When Kingdom falls prey to a serial killer, can Callie uncover the truth before she becomes the next victim?

Unforgiven: (Amish Romantic Suspense Story with Forgiveness and Second Chances)
By Shelley Shepard Gray (Revell)
Release date: May 21, 2024
not available at this time.
Unforgotten
By Shelley Shepard Gray (Revell)
Release date: November 5, 2024
Even though Bethanne Hostetler has found some peace eight years after an attempted assault and the accidental death of Peter Miller, she is still haunted by the memory. When her Englisher cousin, Candace–who has just been crowned Miss Crittenden County–reveals that she has a stalker, all of Bethanne\’s old fears come rushing back. Jay Raber had once been Peter\’s best friend, and the fact that he did not protect Bethanne that fateful night has haunted him ever since. To make matters worse, she continues to avoid him–even as he continues to love her. Jay can only hope and pray that one day Bethanne will see the person he is today and not the boy he used to be.
Unknown Enemy (Love Inspired Suspense)
By Michelle Karl (Love Inspired Suspense)
Release date: May 1, 2016
THE BODYGUARD For professor Ginny Anderson, translating a set of ancient tablets could be the coup of her career—or more danger than she can handle. Someone doesn’t want the secrets of the artifacts to be revealed…and they’ll kill to bury her discoveries. But former Secret Service agent Colin Tapping refuses to let anybody hurt Ginny and appoints himself as her protector—whether she wants one or not. Colin has made mistakes in the past, and keeping Ginny safe could be just what he needs to prove he’s still a capable agent and win back his job. But is he willing to risk paying the ultimate price to reclaim his former life?
Unknown Threat (Defend and Protect Book #1)
By Lynn H. Blackburn (Revell)
Release date: March 2, 2021
US Secret Service Special Agent Luke Powell is lucky to be alive. Three of his fellow agents have died in unusual circumstances in the past ten weeks. Luke is devastated by the loss of his friends and colleagues, and his inability to locate the killer feels like a personal failure. He\’s an expert at shielding others, but now the protectors are in need of protection. FBI Special Agent Faith Malone is driven to succeed and confident in her ability to solve every case she\’s assigned.