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Four mismatched year ten students - Andy, Felix, Jake and Sam - are unwillingly grouped together for an orienteering exercise in the rugged Bremin Ranges, on the outskirts of their hometown.
The boys are shocked that their families and friends no longer recognise them. Andy believes it's because their families have experienced a collective amnesia, but he can't explain the other strange events.
Jake, Felix, Andy and Sam try to discover why their families don't recognize them and there is no evidence they even exist at their school.