Huge PLOTHOLE in the donut hole.

Rating: 8/10 (1 January 2020)

Nobody but Ransom knew about the ATTEMPT to change the medicine.
Why - on what basis - would Fran, who only saw Ransom shuffling trough the bag, try to extort him?
The old man had a cut throat. Why even ask her cousin to get the toxicology report for her?
On top of this illogical unfolding of events, the toxicology report was clean! That should have stopped her even acting on suspicion.
Other weird stuff: when did Ransom have time to torch the lab or kill Fran (who meets the very presumptuously suspected attempted murderer alone and unarmed)? Wasn't he WITH Marta?
Apart from that I did feel it was a bit boring at times. What is the viewer supposed to do if the "murder" is explained early on and no other suspects are presented with opportunity? Sure, they all have reason but none is shown to could have done it.
Nonetheless I spun my yarn of how readily the old man cut his own throat and had a plan ready for Marta's escape. Changed up medicine was the first idea and it smelled like a plan to smoke out the rats in his family. It wasn't though, just ironic heroics to deliver an emotional punch of him committing suicide in vain.
I liked the atmosphere and the acting.
My rating is more a 7,51. The cast made me round up.