Wow. I had high hopes for this book and they did not disappoint! 
Keira having lost her memory on who she is, yet fighting and having the reactions she does gives me so many different theories on who she really is. I love how her being able to see ghosts is explained like a kind of gene mutation that gives her a second muscle to essentially place a veil over her eyes. 
Zoe & Mason are the best of friends and Agade is such a sweet pastor. I love the super small town where this is based, and I feel like everyone has some kind of dark secret or deep regret about the past that causes them to stay in Blighty. 
The Whispering Dead reminds me so much of Ghost Whisperer, but add in some forgotten identity with an assassin skill set. Absolutely love it!