One Last Secret

by Elle Gray, K.S. Gray

PI Bridget “Birdie” Hartley thought the storm had passed.
She found her sister. She survived a shootout.
But peace is proving harder to hold than she ever imagined.

With Ada finally safe, Birdie’s only goal is to keep her that way.
But when a buried cache of secrets surfaces,
hinting at a private island summit, a rising force within a dangerous syndicate, and a captive long presumed lost,
rest is no longer an option...

What begins as a desperate call for help quickly turns into a deadly trap.
Outgunned and outnumbered, Birdie is on the run once more.
Deep in the Oregon wilderness, a sudden disappearance shakes her team’s fragile unity.
As loyalties fracture and the enemy closes in, Birdie suspects the real threat may already be inside the circle.

This is Birdie’s last mission. Her last chance to break free from the darkness.
The walls are closing in.

Disastrous love affairs, widespread duplicity, and the promise of a life she may never reach.
The final showdown is here. And Birdie will risk everything to end it, once and for all.

363 pages, Kindle Edition

Published September 19, 2025

About the author

Elle Gray lives in a small town with her 2 cats, and her handsome husky.
As a girl, she was obsessed with crime novels and thrillers.

Today, she loves writing and creating thrilling novels with courageous, strong heroes/heroines and dangerous psychopaths. She invites you to join her exciting world of detectives and FBI agents that take down killers and kick butt.

Reviews

[Terri Rayo · Rating 5 out of 5]

Great ending to this book series

I highly recommend this serenity springs series. Great stories about courage, morality and being true to oneself. Perfect character development throughout the whole series. Please read all 7 books

[Becki Masorti · Rating 5 out of 5]

I'm going to miss This series about Birdie

This series kept me on the edge of my seat! So many different things going on and so many suspects, you will be surprised to find who the real Black Lantern leader really was!!
If you start the first book be prepared to read the others, one right after another because I guarantee you, you won't be able to put this one down!!!

Great read, great writing and Great author

[Kathleen Ebner · Rating 5 out of 5]

The Black Lantern Organization is still causing chaos.

The Black Lantern Organization has kidnapped some very special people to Birdie. The FBI are getting closer to taking down this monstrous group. Serena is going into a place set up as a serene place to recuperate from the pressures of her job aa an influencer online. As usual the best laid plans don’t always go smoothly. Serena has to go above and beyond what was expected to get what the FBI needs to take them down. You will be holding your breath wondering what is going to happen next!

[Inger Cierniak · Rating 5 out of 5]

USB

computers make a difference. Every time this story gets going.... something goes wrong. Lots of people die. people go missing. Crime runs ramped. Lots of action. Not a cozy mystery so hold on to your Kindles.

[Colleen A. · Rating 5 out of 5]

Couple de gras

Omg this was over the top it was the perfect lead up to this ending in can't stop crying
Fabulous
Best one of this series

[Angie Chase · Rating 5 out of 5]

This was a great ending to a series. I bawled my eyes out at the end. The resolution to Black Lantern hits way too close to the world we live in today and it’s scary. Release the files!!!

[Michael Curry · Rating 5 out of 5]

wow what an incredible adventure

This one was
Hard to put down every day. Couldn’t wait to get to the end to see what they were able to do. Great storyline

[Peggy Underwood · Rating 5 out of 5]

best one of the series

I couldn’t put this down! Keeps you riveted to find out what will happen next!
The series is great. I recommend mystery lovers to read it.

[Carol Dickens · Rating 5 out of 5]

On Last Secret

Wonderful book, I enjoyed every word. I am never disappointed with Elle Gray. I enjoyed every book of this series. Already looking for more.

[Tammy Kelderman · Rating 5 out of 5]

Great ending

Great ending to the series! I love how it all came together and everyone is happy. A must read! Yes

[Barbara Kaake · Rating 5 out of 5]

This was an awesome story about Birdie and sister and Noah and Sean and Birdie going all out to find her friend and finding them with lots of suspense and action. Thank you for this great story and I am sorry that the series is ending but it ended happily.

[Vicki Gilbertson · Rating 5 out of 5]

Wow, I didn't see the corruption with the Black Lantern had everyone fooled. I'm glad that Birdie was able to find her sister and nephew. This was one screwed up group of people with hidden secrets,and the right people are safe and happy, healthy and baby on the way. Of course we have that once again corrupt political party, but Birdie and crew got their paycheck.
I'm going miss more stories about Birdie and crew.

I'm sure that Elle Gray and K.S. Gray will have some more wild adventures for us.

[Barbara Whalen · Rating 5 out of 5]

Excellent series of books by Elle Gray & K. S. Gray

I highly recommend Elle Gray's books...all of them. These books are well written, exciting and will keep you on the edge of your seat. Its also so refreshing to read books that are not filled with explicit sex scenes. Thank you so much Elle and K.S.!

[Mark Devries · Rating 5 out of 5]

Wonderful read. Didn't want it to end.

Terrific storytelling! Kept me on the edge of my seat. Loved the storyline and the ending. Elle has a great way of keeping your interest in all of the books in the series she writes.

[Joanne · Rating 5 out of 5]

Exciting End

I couldn't stop reading this book. Very exciting, very emotional, some unexpected moments. This was a very good series as are all of Elle Gray's. Highly recommend this author. Also l was glad for the ending!!

[KARI TOWER · Rating 5 out of 5]

Must read

The ending is not what I expected at all. Must read and can not wait to read more of her work.

[Larianne Kaiser · Rating 5 out of 5]

This was yet another amazing series by Elle Gray. I loved immersing myself into Birdie’s world & being by her side from Book #1 to Book #7. Highly Recommend!

[Nancy Hohenstein · Rating 4 out of 5]

Technically Imperfect, But Satisfying

While some of the action is technically impossible, the story and romance make for a good read and a satisfying ending.

[Margaret Ann Haller · Rating 5 out of 5]

This is a must read series!!

I enjoyed energy book in this 7 book series! I highly recommend that you read anything written by Elle Gray!!

[Mary Davis · Rating 5 out of 5]

Totally obsessed!

In the past week I have read this whole series..neglecting nearly everything else! Riveting! Love the characters. Shines light on a dark, ugly subject.

[Phyllis Wooden · Rating 5 out of 5]

Absolutely wonderful series

I really loved each book of this series. It checked all the boxes. FBI, edge of your seat mystery, romance. My only complaint is that it’s over.

[Peg Vanore · Rating 5 out of 5]

absolutely a great story.l

This was one of the best thrillers I have read. Kept me up reading right through to the very end!!