Carcass

Back when Cal and his brother Niko were working on a case, they were royally screwed over by the old Gypsy Queen. They barely made it out alive. And guess who just showed up now that their detective agency is struggling, offering them a job.
The old gypsy wants them to find a stolen coffin. Cal would rather help her into one, but this particular coffin holds an evil known as the World Plague – and the Black Death looks like a Sunday picnic in comparison.
But the thief has already skipped town, so the brothers have to hit the road. And if they're very, very lucky, they might just make it back.