I'm trying to remember a book I read. This would have been around 2017.
- I believe it was part of a trilogy.
- It had a Lovecraft vibe; the bad guys were at least 3 Nazis, 2 of whom were brother and sister. They had wires coming out of their heads that connected to batteries and gave them their powers. The brother could move through matter, the sister could predict the future, and the other one had immense physical strength.
- The hero had a son who had no soul and cried all the time.
I think there was also a time-travel element to it.