What kind of murderer would kill his victim and then redress him with his clothes inside out?

That's what the IRT has to figure out on Wednesday's Criminal Minds: Beyond Borders, when they're called to investigate a singer's death in Jamaica. Luckily, Clara (Alana De La Garza) is totally up to speed on all her ancient death rituals. "This is Obeah," she says in our exclusive sneak peek.

O-what now? It's a duppy ritual, she explains to the team. "Its followers believe that every person has two souls, a good soul and an earthly soul," she says. "When a person dies ... the earthly soul remains in the body for three days and if certain burial rituals are not performed" — like redressing the person with clothes inside out — "that earthly spirit can escape the body and become a malevolent spirit called a duppy."

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In other words, duppy = ghost.

Still, according to Clara, duppy rituals aren't very common today, so why is this unsub enacting them?

Criminal Minds: Beyond Borders airs Wednesdays at 10/9c on CBS.

(Full disclosure: TVGuide.com is owned by CBS.)