Sometimes people just...click.

'A highly charged, passionate and tender love story. Wonderful'

Kaliane Bradley, author of The Ministry of Time

'Castillo is a literary firecracker... If you liked Tomorrow, and Tomorrow, and Tomorrow, you'll like this'

Pandora Sykes, Books and Bits

Thirty-something Girlie Delmundo works a day job as a content moderator, flagging and removing the very worst that makes it on to the internet. She's one of the best at it, too - dispassionate, unflinching, maybe because she learned by necessity to wall off all her emotions when she was still a kid - so it's no surprise to anyone when the social-media company for which she works offers her a big salary rise and an office to start moderating its new venture: virtual-reality theme parks, lush and near-perfect simulations of civilizations long since dead.

Girlie takes the job, and getting paid to spend her days wandering the crowds of medieval jousts or exploring romantic Left Bank Paris seems too good to be true. Almost. Sure, she signed up for having to deal with the sordidness of pretty much any virtual space, but as she begins to explore the intricate worlds that she moderates, she notices two deeply troubling things: that there might be something much darker built into the very code of the company, and that William, technically her new boss, a man whose barriers are as mighty as her own, might just be that long-forgotten thing... Girlie's type.