I discovered the Day Soldiers series in 2017 and have really enjoyed each installment, including the 4th book of the series, "Evolution." Fortunately, there are no threads left dangling too badly because it seems this will be the final book in the series even though Brandon had 2 more planned. For those who don't know, Brandon Hale passed away at the age of 45 from cancer on August 20, 2018. He had battled cancer for 4-5 years. It's always sad to see anyone leave this Earth so young. He was a talented author, and I will miss looking forward to new stories from him.