Arey don't be scared. See Rebecca is a suspense novel start to finish. But PB is a family show. Makers probably took only some elements from it. The husband being wrongfully accused of killing his first wife. And the husband locking everything of the first wife away.
But yes, I would like to see what is the evidence against HS? Was there a witness? if so, who? did he/she lie or tell the truth? What exactly happened to Imrati? Was she attacked and the attacker fled and HS came in and Imrati died in his arms. So whosoever came in then might have thought HS killed her. Or was it something else.
Perhaps there was a third person ....let's c.