The Horizon (Arisen #6)

THE OPERATORS FACE THEIR DEMONS
Mission complete, Alpha team enjoys their first chance to breathe and tend to their humanity. But the darkness leaves them alone with their demons - and those who have found love may yet learn that it is fatally incompatible with duty...

THE CARRIER FACES UNIMAGINED THREATS
The JFK steams for Africa, despite rumours of lone Zulus still wandering below decks. But when Dr. Park and Sarah Cameron are trapped in an isolated compartment, they learn that one Zulu can kill you just as dead as ten million - while up on the flight deck, a lone assassin inflicts horrific damage on the hopes for a cure...

LONDON PREPS FOR HUMANITY'S LAST STAND
Amarie and the Tunnellers find themselves resettled in a chillingly post-Apocalyptic London, where mini-outbreaks are hushed up, and the displaced will cut your throat just to take your shoes - all as history's largest fixed fortification goes up along the M25 ring-road around the Capital...

THE ROYAL MARINES DROP INTO HELL
Lieutenant Jameson and his battered Royal Marines launch by air to retrieve a rare biomedical device, which is indispensable to developing a vaccine - but which lies buried at the centre of a perilously rotting structure in a city of millions (all dead). When the walls come down, and the horde descends, Jameson may be the last man standing - and his only chance of survival lies with a lone Apache pilot who refuses to obey her orders to abandon him...

Hope survives - but the story of humanity is not yet written.