ABANDONED. Serial killer Book very similar to “ you”

[Kristen]

I’m looking for this book it’s about a killer and his name is the title of the book and he works in a book store and falls In love with a girl and stalks her . He lives in a small apartment where he keeps his Momentos from his kills in a shoe box in his wall and eventually she finds them.

[Lobstergirl, au gratin]

When did you read it or when was it published?
Cover?
Author's gender?
Where and when is it set?

[Kris]

No response, moving to Abandoned folder.

Kristen (OP) last posted in the group in March 2019.