Dead Serious Case #5 Madame Vivienne. Crawshanks Guide to the Recently Departed, #5

For one brief shining moment, the utter insanity that is Tristan Everett's world makes sense. He's marrying the man he loves, has a dead drag queen for a bestie and is surrounded by an amazing found family. Okay, so his life isn't exactly what you'd call normal. By day, he's a quiet, mild-mannered forensic pathologist, but the rest of the time, he guides lost souls into the light. He's also averted an apocalypse, stopped Chaos from coming through a magic door, and drunk tequila with Death.
It's all a bit bonkers, but it's his life. and he loves it. He's flying high but, like Icarus, it's only a matter of time before he's brought crashing down to earth with singed wings. The strange reality of his life intrudes once again when his friend, Madame Vivienne, is murdered, and it's clear from the beginning that this is no ordinary killing. Someone is using dark magic. Viv's soul has been bound, leaving her trapped and unable to communicate.
Tristan, Danny, and their friends must uncover the truth and find the killer. But the deeper they delve into the old bookshop in Whitechapel, which has been in the Crawshanks family for generations, the darker and the more dangerous the secrets that begin to unravel. And what they discover may just change their lives forever.