I seriously don't believe it'd be that over quick, with the pace, the introduction, the problem and the pacing it is far too convenient that the issue about the "dead detective" would be resolved in a meager few chapters.. it's just far too shallow and predictable.
.. and there's yet to be more clarification to the circumstances other than (she died, and we were separated)
so even if it ends up with Seista truly resting for eternity, I doubt it'd be due to the heart transplant.
For a story with a mystery, that's too much of a predictable revelation, even for a novice in that particular genre.
I hope this series won't disappoint, there's quite a lot of emphasis on her existence to make it this easy.
Feels like they're trying to lead us by the neck with that trap info. Suspicious.