From the beginning I found the demographic of the family/friends ensemble totally unconvincing.
It was so confusing and even at the end I had no idea who the children's parents were.
The rest of it was unconvincing as well. A load of people running around acting scared did not actually convey the horror of the situation. One assumes this was based on the attack on tourists in Tunisia in 2015 when 38 people were murdered.
A much more convincing film of this genre is the Norwegian film, Utøya 22. Juli (2018).
I don't know whether it is the writing, storyboarding or editing that is at fault, but there was a distinct lack of continuity.
You have terrorists shooting people indiscriminately and without any forethought except when they are faced with a featured cast character ... then they don't shoot them. They allow themselves to be engaged in pointless dialogue. Then there was the clichéd scene of a terrorist and tourist grappling on the floor trying to wrestle a gun free, with the usual inevitable result.
The scene when the tourist looks on dumbly at a terrorist confrontation and walks stupidly into a knife is just embarrassing.
Why did Keely Hawes character receive a police commendation when she was not a serving police officer and it happened in a foreign land?
At best it would surely have been a civil award.
And her going back into the force just seemed unbelievable.
I really lost interest as the three part drama progressed, particularly the last episode which was boring.