The Worthy Ones

(Set in year 3400) McKenna has only a few days to retrieve what was rightfully hers, and whilst doing that, saving all humanity and innocent lives. The population increases to the extent where there isnt enough food to go round in Yaneb, which used to be England. The government of the future takes hearts (everyone can live a max of 150 days withoout any major organs) and puts children from 12-18 in an arena where they have to race through life threatening obstacles to prove their worthiness in the world. It is a battle of the fittest