Ben and Zane probably shouldn't have wandered through the desolate streets of London that late at night. They were chasing a hot tip about a vampire running amok, just being generally creepy and nihilistic. Luckily, local professor of the supernatural, one Dan Caves, was willing to outfit them everything they'd need to survive the task. Silver crosses, impossibly heavy guns, and over-the-top faux british accents that'd send the ranks of the undead running. Cor and blimey, police girl.