Those Who Walk Away - Patricia Highsmith

That letter...

 

[Source]

 

What is going on in this book? Why doesn´t Ray just leave? Why has he written that letter? What does he want from Ed? Why is Ed being the most imcompetent moron of all

 

not making sure that his attempts at killing Ray have been successful ... twice!

(show spoiler)

 

I don´t understand!

 

This book was off to a good start, but I´m slowly getting tired of it.