Unfinished Business (a Dead Boy Detectives) AU

My adaptation and continuation of where Charles and Edwin left off in the "Dead Boy Detectives" series. If you haven't finished S1 I wouldn't read this, as there are some spoilers throughout the story.

Edwin has been taking the loss of his friend, Niko, quite hard. He hasn't paced around the office with passion in months, he was forgetting to bring things with him on their cases, which was very very unlike him. They hadn't seen Edwin have even a smidge of a smile in ages. Crystal and Charles, and even the night nurse, were worried.

But when Death's niece, "Allison" an untrained, and confused being, clearly unfit to do Death's bidding pops into their lives saying she has a mission to find Niko and bring her to the After Life, the group is sent into chaos.

Niko wasn't in the After Life?

Where was she?

Why did Death send her niece of all people?

Could they find her?
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A continuation and adaptation of what comes next for the mystery solving ghost boys and living girl medium trio.