I can’t get “Old Soul” by Susan Barker out of my head

It's probably the best written horror novel i've read in years and it's strange I can't find any posts about it on here.

To give you the jist of it: a chance meeting between a man and a woman who are both late for a flight leads to a strange realisation. They've both lost loved ones in horrifying circumstances where a mysterious european woman was involved. She inserts herself into strangers lives, photographs them and moves on. Then they lose their minds and die horribly.

This leads the man, still traumatised by what happened to his closest friend, down a rabbit hole to discover who this woman is and what she's actually doing to cause this. Unveiling the decades of carnage she's wreaked all over the world.

Meanwhile we follow the woman as she seduces her latest victim on a hike in the New Mexico desert.

I don't want to give too much away but the way this book can make you empathise with, even like, what is essentially a serial killer is chilling. I gorged on all 288 pages in the space of a day and days later it's still haunting me. The epilogue especially is sublime. I can't recommend it enough.