"A slow fire burning" is the third novel by Paula Hawkins, and it's as different from its predecessors as "Into the Water" was from "The Girl on the Train". Which, of course, is a very good thing. After all, if I wanted to read "The Girl on the Train" or "Into the Water" again, I could just - wait for it - read them again.
So, it's a psychological thriller as well as a murder mystery. The characters are damaged and flawed, yet you like being in their company. The unusual friendship between a retired widow and a much younger woman was a lovely touch.
Warning: dark themes.