Sometimes it seems like a series can start to run out of steam after the first trilogy of books. That is definitely not the case with the Demon Squad. The characters keep evolving, the world building gets better with every book, and you become seriously invested in where the story is going. Echoes Of The Past is an excellent addition to the series, and I hope more people discover Frank and company as well. Everyone needs some snark in their lives. I will highly recommend this book, and this series as a whole!