i really need a cozy stand-alone murder mystery.

hi! i’m looking for a cozy murder mystery i can read in a few hours or so. i have a road trip tomorrow.

if any of you guys have read/seen black butler and got to the book of murder arc, i’m wanting something like that, yanno?
confined murder mystery, a group of people stuck/staying somewhere and people are getting picked off one by one. plot twists, accusations, betrayal, i’m fine with a bit of romance too :)!!
YA or adult idrc.

preferences but not requirements:
– no POV switching, just one MC
– kindle unlimited
– short/medium length
– good dialogue/immersive
– not too confusing

i wish i could compare what i want with another book i read but unfortunately i’ve never read a murder mystery before.