K.S. Gray Books in Order

Hoping for peace, FBI agent Olivia Knight relocates to Belle Grove, Virginia—only to find a starving, terrified girl on her doorstep. Her search for the child’s captor exposes a serial kidnapper hiding in the shadows of her new hometown.

In the tidy streets of Beacon Hill, ritualistic murders suggest a twisted belief system at work. Olivia Knight must decode cryptic messages and infiltrate a secretive group before its followers decide more blood is required.

A death that looks like suicide leaves too many unanswered questions for Olivia Knight to walk away. Digging into tangled relationships and buried affairs, she uncovers a pattern of manipulation that makes "self-inflicted" feel like the perfect cover.

A glamorous trip aboard the Astoria turns deadly when a high-profile passenger is murdered mid-journey. Olivia Knight and Brock must navigate tight quarters, unreliable witnesses, and shifting alibis before the killer slips back into ordinary life.

A decade-old cold case about a model student who vanished resurfaces when new evidence lands on Olivia Knight’s desk. As she and Brock peel back a family’s polished façade, they discover that being the "good daughter" came with a lethal price.

An elite gathering ends with a body and an airtight room that no one should have been able to enter or leave. Olivia Knight is called in to untangle the locked-box mystery, where every guest has something devastating to hide.

A masked man abducts a suburban mother from her own doorway, and nothing about her past quite fits the victim profile. FBI agent Olivia Knight goes undercover to learn who Isabella Walker really is—and why someone decided she had to vanish.

An apparently ordinary marriage hides something monstrous, and one late-night incident blows it open. Called to investigate, Olivia Knight discovers that the most dangerous secrets in a neighborhood are often the ones no one wants to admit exist.

A competitive event meant to bring people together ends in death, and every participant swears the same innocence. Olivia Knight must work out who turned the games fatal before another round of "fun" becomes a rehearsal for murder.

In the Halloween-obsessed town of Hollow Nest, a teen girl is found murdered in a black cat costume. Surrounded by rumors, costumes, and staged scares, Olivia Knight and Brock have to find a very real killer hiding behind the festivities.

A relaxing couples’ getaway takes a sharp turn when a friend disappears and blood is found where she was last seen. Olivia Knight and Brock must sift through jealousies, affairs, and carefully curated vacation personas to learn what really happened.

A case built on one family’s testimony starts to crumble when a single lie is exposed. Olivia Knight must decide which stories to believe as she navigates conflicting witnesses, hidden affairs, and a truth someone is desperate to keep off the record.

A remote cabin meant to be a refuge instead becomes a trap when someone close to Birdie vanishes there. Surrounded by dense woods and creeping fear, she uncovers clues that tie the disappearance to an enemy who’s been watching far longer than she realized.

Serenity Springs lives up to its name until panicked parents call about missing teens. PI Bridget "Birdie" Hartley starts with what looks like a runaway romance and uncovers a pattern of vanished couples that suggests something much darker stalking the town.

A suburban housewife vanishes, leaving behind a life that looks almost too perfect. Olivia Knight’s case uncovers affairs, financial secrets, and a woman who may have been far more dangerous—or far more endangered—than anyone around her knew.

A wedding in Serenity Springs is thrown into chaos when the maid of honor becomes the prime suspect in a shocking crime. Birdie Hartley must sort true love from toxic loyalty to find out who’s willing to kill rather than say "I do."

Multiple teen girls vanish from a coastal town, dismissed at first as runaways. Brought in after the pattern turns chilling, Olivia Knight and Brock go undercover to learn whether the girls ran away together—or were lured into something far worse.

At a high school reunion, old classmates gather to reminisce—and one of them never makes it home. Olivia Knight digs into decades-old drama, bullying, and buried guilt to find out who decided the past wasn’t finished with them.

In the town of Eagle Falls, Birdie Hartley faces a stalker whose fixation turns lethal. As mysterious accidents escalate into outright attacks, she must figure out whether the threat comes from a stranger—or from someone who’s been part of the community all along.

A woman known for telling other people’s stories is found dead just as she’s about to expose something explosive. Olivia Knight’s investigation becomes a race to read the victim’s last work—and figure out who wanted to stop the final chapter.

On the brink of finally exposing the network that has tormented Serenity Springs, Birdie Hartley is drawn into one final, brutal game. Every clue points back to her own past, and one last secret may decide who walks away alive.

A quick escape to a picturesque destination becomes deadly when a guest turns up dead and everyone has a motive. Olivia Knight must unpick layered alibis and simmering resentments before another "accident" ruins the trip for good.

A priceless pink diamond vanishes from a museum display and is replaced with a flawless fake. Going undercover among staff and donors, Olivia Knight races to recover the stone before the theft sparks international fallout.

A road trip to track her sister’s last known movements leads Birdie to a tourist town where women are disappearing. With a predator turning the area into a private hunting ground, she and Noah must risk everything for one final chance at answers.

Investigating a string of robberies, Birdie Hartley starts receiving anonymous "gifts" on her doorstep. Each package is more ominous than the last, and it soon becomes clear the sender wants blood as payment. To protect those she loves, Birdie has to turn the tables on the hunter.

When Olivia Knight and Brock move into their new apartment, the friendly woman next door quickly becomes a constant presence—and then abruptly disappears. Following the trail of lust, obsession, and betrayal she leaves behind, Olivia finds a case that hits uncomfortably close to home.

A pharmaceutical executive dies in a suspicious crash while Olivia Knight investigates fraud within his company. Unusual drugs, secret payments, and a second death in an underground facility turn a corporate case into a much larger conspiracy.

Olivia and Brock's Las Vegas holiday is interrupted when a drunken stranger dies after making a cryptic remark. Their investigation takes them undercover among impersonators, traffickers, and rival mobsters, where shifting loyalties make every move dangerous.