Copper and Cobalt

When a stranger collapses at the only real-magic shop in Brooklyn, all signs point to attempted murder. It's up to the owner, Phil, to find out who is behind the attack and ensure that no one else gets hurt. Since Minni Masterson just happens to have the day off, she decides she might as well help.
That was her first mistake.
As events unfold, Minni finds herself in the middle of a game of cloak and dagger. Someone has hidden a mysterious sapphire necklace, the Cobalt Star, and is killing anyone who gets close to finding it. The trail of evidence will lead Minni across the world, into other realms, and deep within the Earth.
She'll also be reunited with her frenemy, the dragon-turned-human Aiden Drake, who has an unlikely role to play in solving the mystery. Through Drake, Minni will get a glimpse at the inner workings of dragon society and politics, which she cares little about. All she wants to do is catch a killer, go home, and snuggle up with her boyfriend.
Is that too much to ask?
Before it's all over, Minni will crash a fancy party, be an accessory to a kidnapping, and literally lose time.
This is what she gets for being helpful.