Shona’s character is the centre of the storyline after her son goes missing.
The mum is clearly frustrated and feels Jimmy isn’t doing enough to find him.
Speaking about what’s in store for Rachel, she concluded: “I think we find Rachel to be a very strong woman and her whole focus is to find her son, Connor, and if it means she has to go out and search for him herself, then she’ll do that.
“Like any parent who has a missing child, Rachel feels like things aren’t moving fast enough so she does it herself. She’s not that impressed with Perez but it’s not personal, it’s situational.”
Shetland returns on Wednesday at 9pm on BBC One.