Synopsis:
In the misty coastal town of Nightfall, Oregon, Officer Eden Mercer faces her most harrowing case yet. When a fishing charter boat sinks under mysterious circumstances, leaving multiple casualties and one traumatized child survivor, Eden is thrust into a labyrinth of lies, greed, and murderous intent.
As she delves deeper, Eden uncovers a sinister web of financial fraud and deadly secrets, stretching from Nightfall’s quaint streets to the treacherous waters of the Pacific. With each revelation, the danger mounts, forcing Eden to confront a killer who will stop at nothing to keep the truth submerged.
The clock is ticking as Eden races to unravel a complex web of deceit that stretches from Nightfall’s seemingly peaceful streets to the highest echelons of local power. With each new lead, the list of suspects grows, and Eden soon realizes that in this close-knit coastal community, anyone could be harboring deadly secrets.
When another life hangs in the balance, Eden must risk everything to navigate the treacherous depths of human depravity. Can she unravel the truth before the killer strikes again, or will she find herself dragged under by the weight of Nightfall’s darkest secrets?

Review:
What started out as a relaxing day at the beach quickly becomes the scene of a gruesome discovery. She and her partner quickly learn that there is more to the story and that everything points to a boat accident, which raises more questions than answers.
This is a story about the secrets people keep, the consequences of their actions, and the search for the truth.
The highlight of the story for me was the growing friendship between Eden and her partner(s). Her K9 companion obviously cannot be forgotten either. 🙂
Eden is someone who doesn’t accept “no” for an answer. If she knows something fishy is going on, she will not stop until she gets to the bottom of it. Not everyone appreciates that particular trait of hers, and when her boss told her to stop, fearing the repercussions of her poking the wrong rich bear, I was frustrated for her.
Her connection with Sophie was also very special to witness.
I enjoyed this one a lot, although I still feel that the first two books in the series have been the strongest for me so far. The audiobook was a pleasure to follow along to and the narrator did a very good job to bring the story across.
🌙 Recension: Treacherous Depths (Eden Mercer K-9 Mystery Thriller #4) by Paige Black
📚 Genre: Thriller, Crime
📅 Release Date: June 4, 2026 (Audiobook)
📖 Publisher: Charmed Pages Publishing
👤 Narrator: Hannah Somerville
📗 available in various formats – included in Kindle Unlimited
📱 Read as: Audiobook
💸 I received a free copy and am voluntarily leaving a review.
🗣️ Language: English
📆 Pages / Listening Length: 9h 5min
⭐️ 4/5
Interested in more?
- Review: Duty and Love by L.L. Riley
- Review: Salt and Shadow: Legend of a Cursed Bloodline by Kate Beaumont
- Review: Fatal Invitation by S.F. Baumgartner









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