Book Review: Five Total Strangers

Five Total Strangers begins with our protagonist, Mira on a plane ride back home just before Christmas. There is a large winter storm approaching and all flights are cancelled, so in desperation Mira and some other college - age passengers rent a car in an attempt to reach their destinations. Woven between the main plot, we read letters sent to Mira from a mysterious person she met while in the hospital around the time of her aunt's death. The person's letters take a very... stalker-y tone... and they appear to have never reached their destination. As the story goes on, the sender grows more and more desperate alongside the distress of her party.
The story has well written language and description, and it was easy to visualize the setting and the mental state of the protagonist. However, it is supposed to be a sort of mystery? It's hinted that there is a saboteur among Mira and the four strangers, but it was fairly easy for me to figure out who it was early in the book, which made the "twist" at the end feel over dramatized and the red herrings obvious. Basically, the book tries to sell "I don't know who to trust and there's nowhere to go!"but it didn't really meet my expectations. The main character Mira has no real agency, which makes sense, because she's trapped in a snowstorm, but at the same time, the book doesn't really analyze the sense of powerlessness in a situation out of your control. Mira just kind of feels uneasy and goes along with whatever the rest of the characters say, and the book doesn't really address this.
Also, the end was unrealistically soon after the climax in my opinion. After the "twist," the rescue came so quick that it made me wonder, "why could this not happen sooner?..." It just felt irrational compared to the rest of the story, and this narrative whiplash lowered my opinion.
Despite my qualms with the story (it might just be over-analysis on my part) I enjoyed this book. It kept me entertained for at least a day, and the author was decent at evoking dread by constricting the escape routes of the story's environment. I'd recommend this book if you enjoy quick thrillers for a snowy day.