So how do you get hold of it?
You unlock the Grappling Hook during the “Broadcast” story mission.
It’s a Level 4 mission which involves scaling the top of the tallest tower in the city.

If you want a more in-depth explanation, read on.
But beware: minor spoilers follow.
You’ll find it embedded on the wall to the left when you reach the elevator shaft.

You’ll need to pay 2000Old WorldMoney and 2 Military Tech to make it upgrade the blueprint.
If you’re not sure about the latter requirement, check out our guide onDying Light 2 Military Tech.
That’s all you should probably know about unlocking the ever-useful Grappling Hook in Dying Light 2.
