Crispin is a disgraced warlock attempting rehabilitation. He had no idea when he was recruited, as a child, by a blood magician that he was doing anything illegal. It was only when his mentor and caretaker was found guilty of murder that Crispin's involvement became known. He's been offered several mentors to re-train him in acceptable use of magic--and has failed all attempts, his magic--graphimancy--simply doesn't work like other types. Using his forbidden bone pen (fashioned from one of his own finger bones!) Crispin can draw with his own blood and make magic happen. It's a bit harrowing, and highly frowned upon. 
 4.5 Stars 
 Ned and Crispin met when Ned assisted in the capture of Crispin's murderous mentor. They have maintained a clandestine love over the past several months, despite Ned's aversion to magic. He is "flit" able to hear magic, and he also despises this ability. As Crispin takes on yet another mentor, Ned's getting embroiled in a magical plot--jar sellers, like his neighbor, are being killed in extraordinary ways. Ned can hear the use of magic, and Crispin breaks his oath to save Ned and his rag shop for certain destruction. As the story unfolds Ned and Crispin learn that a great danger is being unleashed, and it's up to them to save London... 
 It's a fantastic mystery, and a sweet romance. This book is the first in a spin-off series from the Charm of Magpies, and fully enjoyable on its own--though I will admit to rushing back and buying up the Charm of Magpie books. I've not read a book by this author that I haven't thoroughly enjoyed, so it's not a big gamble. I received a review copy of this book via NetGalley.