Hank Green

The Carls just appeared. Coming home from work at three a.m., twenty-three-year-old April May stumbles across a giant sculpture. Delighted by its appearance and craftsmanship, April and her friend Andy make a video with it, which Andy uploads to YouTube.

The next day April wakes up to a viral video and a new life. News quickly spreads that there are Carls in dozens of cities around the world - everywhere from Beijing to Buenos Aires - and April, as their first documentarian, finds herself at the centre of an intense international media spotlight.

Now April has to deal with the pressure on her relationships, her identity and her safety that this new position brings, all while being on the front lines of the quest to find out not just what the Carls are, but what they want from us.

Book 1 in The Carls series.

The statues disappeared in an instant. While they were on Earth, they caused confusion and destruction without ever lifting a finger. They also contributed to the untimely death of April May: a young woman who stumbled into their path, naming them the Carls and gaining viral fame in an avalanche of conspiracy theories.

When April's friends try to carry on with their lives, a series of clues arrive - mysterious books that seem to predict the future - and which also seem to suggest April may be very much alive... But there's a bigger mystery to solve.

Did the Carls ever really leave us, and what happens if they're here to stay?

Book 2 in The Carls series.