Justina Ireland 
Jeff Allen vs the Time Suck Vampire [PDF ebook] 

Jeff Allen needs a new phone. But for a new phone, Jeff needs money and therefore a job. When he starts working at the new mobile phone shop for Mr Vlad, he thinks he’s got it made. Soon, he notices things aren’t quite right. The new phones come preloaded with a game, and everyone in town including his friends seem obsessed. But not normal-obsessed; they’re Devil’s Pass obsessed, which, in his town, often leads to very bad things. Jeff has to find what’s causing the obsession and break the spell before the town and his friends succumb to the mortal danger in front of them.