A group of twentyish year olds all live in the same house and one girl from their group goes missing or is found dead and the housemates try to cover it up

[Taylor]

A detective comes to a group of twentyish year old girls and guys live in a house together (that i think they rent from an old man if i'm not mistaken?) one of the girls from that group goes missing or is found dead and everyone else in the house tries to cover it up for some reason

[Nóinín]

The Likeness by Tana French was the one that first sprang to mind. However, that one's got a special premise that (no spoliers here) you'd hardly have forgotten or failed to mention. You may want to check out this list instead: https://www.goodreads.com/list/show/1...

[Lynda]

If it’s not The Likeness, maybe Dismantled by Jennifer McMahon or A Fatal Inversion by Barbara Vine

[Aspiring]

It sounds a lot like Red Leaves by Paullina Simons

[Summer]

Maybe Murder Underground?