The Appendix Conjecture

Google Search: Which organs does a human not need?

Imogen Bland is out of money. She's out of a home too-soon. She's willing to go to any lengths, even searching up people willing to buy unneeded body parts. She then meets this doctor by the name of Black, who wants her appendix. For reasons unknown, her appendix donation begins to drag her into situations she never expected to be stuck in. But one question remains. Why does Black need human appendixes?