Enemy Series, Books 4-6

They'll chase you. They'll rip you open. They'll feed on you . . .The Enemy (Book 1)When the sickness came, every parent, police officer, politician - every adult - fell ill. The lucky ones died. The others are crazed, confused and hungry.Only children under fourteen remain, and they're fighting to survive.A gang of children begin their quest across London, where all through the city - down alleyways, in deserted houses, underground - the grown-ups lie in wait. The Dead (Book 2)Jack and Ed are best friends, but their battle to stay alive tests their friendship to the limit as they go on the run with a mismatched group of other kids. And one adult. Greg, a butcher, who claims he's immune to the disease. As a fresh disaster threatens to overwhelm London, they realize they won't all survive...The Fear (Book 3)DogNut and the rest of his crew want to find their lost friends, and set off on a deadly mission from the Tower of London to Buckingham Palace and beyond, as the sickos lie in wait. But who are their friends and who is the enemy in this changed world?