On my blog today, I’m sharing my thoughts on the new thriller by Sarah Hornsley, One Dark Summer.

BLRUB
Lily has spent her whole life not knowing the truth.
Now, one island will change everything.
When she was four years old, Lily’s mother, Penny, walked out the family home and never returned. Growing up, Lily tried to block out the pain of betrayal. But years later, when Lily learns her mum’s family used to own a holiday home on Osea Island, she can’t resist booking a last-minute trip, hoping to finally find a connection to her mother.
But Osea is no ordinary place. Tidal and remote, it keeps its secrets close.
As Lily begins to peel back layers of the past, she uncovers a web of silence, betrayal, and pain stretching back twenty-five years. The island holds the truth of what really happened to Penny and why she never made it back home.
But some secrets aren’t buried in the past. Nor are they still on the island. Some are closer than Lily ever imagined.
MY THOUGHTS
One Dark Summer by Sarah Hornsley is a layered mystery with dark family secrets. We meet Lily, who was abandoned by her mother when she was only four years old. There isn’t much Lily knows about her, especially as her father refuses to speak about her. Still, Lily is desperate to learn more about her mother. But what she isn’t prepared for is the dark family secrets she is about to uncover that will rock her to her very core.
I really felt for Lily, especially as she tried to learn more about her mother from her father. I couldn’t see why he was refusing to answer her questions. It was clear to see how much this pained Lily, and her desire to just know something shines through on the page. I kept thinking that it was the pain of losing his wife that made it too painful for her father to revisit that time. It made me wonder just what Lily would uncover, and I felt fearful for her as she takes matters into her own hands by returning to the place where her mother grew up, especially as she has no clue what she’s going to find.
This is the first time I have heard about Osea Island, the place where Lily’s mother lived and grew up. The atmosphere of this setting really adds to the tension. It made it even more possible to imagine the dark secrets the island might hold. It was fascinating getting to know Lily’s mother’s family, and I especially liked Lily’s aunt. Sarah Hornsley gradually builds an uneasy sense of unease on the island, especially as she takes us back in time to when Lily’s mother was living there.
There are some heart-stopping reveals as Lily discovers the truth about what happened all those years ago. It makes the ending all the more emotive and powerful as dark secrets are finally revealed. If you’re looking for a twisty read with plenty of atmosphere, One Dark Summer is definitely for you.
Publisher: Hodder & Stoughton
Publication date: 9th July 2026
Print length: 320 pages
One Dark Summer is available to buy:















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