Black Water is a collection of three short stories from the Jane Yellowrock series and written by Faith Hunter, which was collected and published after Black Arts, but takes place during various moments in the timeline. To avoid spoilers, it is best to read this anthology after Black Arts as there is one story "Off the Grid" takes place some time after the seventh book.
"Black Water" (★★★★☆) has Jane Yellowrock recruiting interesting and disturbing characters to find two kidnapped women, who were taken by an escape prisoner with a grudge with Jane Yellowrock, because she killed his sister, who was a werewolf, in one of the raids that she executed. This short story takes place after Blood Trade.
"Snafu" (★★★★☆) has a young Jane Yellowrock showing up for her internship with a securities firm. However, before she even gets her foot in the door, she is accosted by two street toughs and is forced to draw on her new-found Beast-magic to defend herself. This short story take place prior to Skinwalker.
"Off the Grid" (★★★★☆) has Jane Yellowrock teaming up with a reluctant Nell Ingram to find missing vampires that has been captured by the God's Cloud of Glory Church – the cult that Nell Ingram was born into, raised, and eventually renounced. This short story takes place after Black Arts from the Jane Yellowrock series and prior to Blood of the Earth of the Soulwood series.
For the most part, I really like these short stories, while one does not really need to read this book to continue with the series, it is highly worth it, to get the greater sense of the Jane Yellowrock universe. All the short stories were written well and comparatively speaking about the same level of enjoyment for me. "Off the Grid" is especially wonderful considering it introduced the character Nell Ingram, who is the protagonist of the spin-off series Soulwood.
All in all, Black Water is a wonderful collection of short stories that expands and strengthens the fictional universe. It expands the stories of major characters, relationships, and introduces new characters that expand this wonderful universe.