After the sudden death of her father, Miriam discovers her dad's script about an obscure band called Rivo; prompting her to finish the script. She discovers secrets connecting her dad to them, & family secrets that will change her forever.

After his wife suffers a traumatic accident, an anesthesiologist resorts to a surrogate mother to carry their child, but this illegal step soon leads him into a mysterious and dangerous world.

The events take place in a historical context, in the 11th century, where the leader of the Assassins, Hassan al-Sabah, and his leadership of the band that was famous for carrying out bloody assassinations of prominent figures at that stage.