A book where the reader is at first lead to believe that the main character is a good person but then turns out they are actually bad and the cause of all the problems going on in the story.

[Bonafide Bookworm]

Something that is primarily geared towards adults.

[MJ]

Truth in my Lies
https://www.goodreads.com/book/show/4...

[Rachel]

The Last Weekend

Gillespie and I

[...cats?]

Kind of Bunny by Mona Awad
The next few are sort of spoilers:
(view spoiler)[Darling Rose Gold by Stephanie Wrobel (hide spoiler)]
(view spoiler)[Bitter Orange by Claire Fuller (hide spoiler)]