The Black-Horned Grave is the second book in The Demon-Sleuth Scrolls, and in this book, we follow the Ninth Crucible as they try to solve an unimaginable mass murder. 
I loved that there is a lot more character development, From the adorable and feisty Cam, Percy with the loveable Flax and Jax, Raoul who we see growing and adjusting to fewer rules and more spur-of-the-moment investigating, to the amazing and fierce Nysska.
The Black-horned grave has amazing world-building.
There is a well-developed, fast-paced storyline, and the combination of murder mystery in a sci-fi fantasy world makes it a fun, unique, and intriguing read. 
The action scenes, and there are a lot, are really immersive, detailed, and also sometimes rather gruesome.
I couldn't help cheering on our main characters and felt sorry for them more than once.
Dan Jolley's storytelling brings that sense of something dark, and he builds tension by revealing secrets so
that it keeps you on edge as you are trying to piece the puzzle together.
Now the ending, left me blindsided, in tears, and just wanting to read the third book.
Be prepared for a massive cliffhanger, don't say I didn't warn you ;)