The Black Tattoo by Sam Enthoven

An ancient evil has been unleashed. Now one boy's rage could destroy us all...

Esme's hard brown hands lifted fractionally from her sides. Her amber eyes glittered as she faced her enemy. 'No tricks' she said. 'No more lies. You and me are going to fight this out to the finish. Right now.'

Jack doesn't know what he's got himself into. One minute he and his best friend Charlie were in Chinatown having crispy duck with Charlie's dad, then suddenly they were in a mysterious room above a theatre, with some the strangest characters they'd ever encountered. And they were about to take the test...

The test transformed Charlie - leaving him with the distinctive marking of the Black Tattoo. They boys' meeting with Esme - a young girl with the most impressive martial arts skills the side of Bruce Lee - her huge and hairy father Raymond, and the mysterious Nick, seemed to have swept Charlie and Jack into a world they had no ideas existed.

And it was only going to get weirder...

The cover is slightly damaged, but the book is in good condition