Jisei is a great mystery--it's about a teen who can read the last few moments of a murder victim's life by touching their corpse, and he solves a murder mystery at a small coffee shop. And that's just the first story in the series! If you enjoy it, I also recommend the other two in the series, Kansei and Yousei (though the basic murder mystery set up in each is different, they also follow an overall arching story arc, and contain spoilers for each other so I recommend following each in order: Jisei--Kansei--Yousei).
Date Warp (available
here and
here) is a romance with sci-fi elements to it. It's about a college student named Janet who goes on a date with Bradley, and they end up stranded in a mansion where...stuff happens.
If you're looking for something free,
Locked-In is a neat artsy little title about a woman named Jacqueline Brown who's paralyzed in a car accident...or was it an accident? As she lies back and recalls her past, you must determine whom you can trust to help Jacqueline survive.
And then there's
The Loop and
The Madness, both of which are horror titles (The Loop's focus is on supernatural horror; The Madness is psychological horror). They both share similar plot elements, but take a different approach to these elements. Which one you find scarier might depend on what scares you more, but I personally find the latter to be scarier.
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