I'm going to list the seven books in no specific order below. I highly recommend trying at least one, if not all of them out. They are sure to make a great read!
Our Dark Secret
https://www.myweeklypreview.com.au/win/win-a-copy-of-our-dark-secret/
Two girls, two dead bodies, and a hell of a thrilling story in between them. Get ready for a dark and foreboding story that will show that the past doesn't always stay where it should be.
And Then There Were None
https://802tix.com/events/and-then-there-were-none-2-7
10 strangers lured to an island, and as they start to drop dead one at a time, the survivors struggle to find our who the killer is between them before none are left alive, but can they?
One of Us is Lying
https://www.amazon.com/One-Us-Lying-Karen-McManus/dp/1524714682
Five students enter a class room, and only four leave alive. Each one seems to have their own reasons and possible motives for killing him, but one thing is for sure, someone is lying.
The Cuckoos Calling
https://www.amazon.com/Cuckoos-Calling-Cormoran-Strike-Novel/dp/0316206849
After a death of a supermodel known as "The Cuckoo" is ruled as a suicide, her brother senses foul play and hires a private investigator to find the truth. The story will take you through the world of dreams, yet some are more vile than others.
The Secret Place
https://en.wikipedia.org/wiki/The_Secret_Place_(book)
A boy is found murdered at an all-girls boarding school, and the mystery remains yet unsolved, until around a year later, when a photo of the boy is found, with a caption that reads "I know who killed him". This prompts a dive into a world of tangled relationships and one ruthless murderer.
Murder on the Orient Express
https://www.bulbapp.com/u/novel-analysis-murder-on-the-orient-express-agatha-christie~1
A detective rides a train home one snowy day, and soon after midnight, the train gets stuck in a snowdrift, yet in the morning after a wealthy businessman is found stabbed to death, and it is up the detective to find the killer on the train before it is too late.
Stalking Jack the Ripper
https://www.amazon.com/Stalking-Jack-Ripper-Kerri-Maniscalco/dp/031627349X
A wealthy lady aristocrat is set for life. She has the world laid out to her, yet she chooses to study forensic medicine, a choice that drags her into a series of murders, all savagely and gruesomely killed. The ensuing investigation leads her back into her own sheltered life for a horrifying reveal.