There are 8 books in the O'Halleran Security International series. The newest book is Deadly Redeemer which came out in 2023.

1
Deadly Secret

Book cover of Deadly Secret
She gave him her heart. He gave her nothing but lies.

Gwendolyn Tamberley thinks she's found the perfect man—a skilled contractor helping renovate her homeless shelter. But Beck O'Halleran isn't who he claims to be. He's a former FBI agent hunting the Russian mobster who killed his partner, and he's…
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2
Deadly Disciple

Book cover of Deadly Disciple
An honorable man driven by the need for retribution ...

Caleb O'Halleran is a Tactical K9 Specialist with the FBI's elite Hostage Rescue Team. Finding the traitor responsible for his K9 partner's death is the only thing that matters ... until he meets an enchanting, strong-willed doctor.

A noble doctor…

4
Deadly Judgment

Book cover of Deadly Judgment

They thought the nightmare was over. They were wrong.

Two women buried alive. Two handwritten wills clutched in dead fingers. The killer's signature is unmistakable—but impossible. The original monster died behind bars years ago.

Emily O'Halleran won't let her best friend become another forgotten victim. She'll tear apart every lead,…

5
Deadly Apprentice

Book cover of Deadly Apprentice

His scars are a gruesome reminder of why they all must die…

To purge the terror from his past, a madman sets about punishing innocent victims for the crimes of another. Each death brings him one step closer to his ultimate target. Will he make it through his list before…

6
Deadly Resurgence

Book cover of Deadly Resurgence
For seven years, she's been hunting a killer. Now the killer is hunting her.

Kinsley Hill has spent nearly a decade writing a blog designed to lure the Last Will and Testament Killer out of hiding. The monster who murdered her sister thirteen years ago thinks he's untouchable. He's wrong.…

7
Deadly Watcher

Book cover of Deadly Watcher
A desperate girl fleeing a nightmare...

Thirteen-year-old Felicity Miller has endured years of abuse at the hands of a ruthless sex trafficker. When she learns she's about to be sold, she risks everything to escape into the dark woods of Whidbey Cove.

A woman haunted by her own past...

Christina…

8
Deadly Redeemer

Book cover of Deadly Redeemer
She's been living a lie her entire life...and didn't even know it...

Dulce Houldcroft thought she knew who she was—until armed men stormed her quiet life, demanding answers about a mother she watched die twenty years ago. Now she's running for her life, and the only person who can save…