Based on the search results, it seems that Cain Dingle and Caleb Milligan are up to some shady business in Emmerdale. They are hiding something and holding someone hostage in a remote barn. The identity of the hostage is not clear, but some fans have speculated that it could be Craig, Jamie, or someone close to Harry. In a recent episode, Caleb and Cain were seen nailing wood up as a person was trapped inside a room, and the mystery person kept banging on the wooden panels as they returned. The exact nature of their plan is not yet known, but it seems that they are keeping it a secret and dropping cryptic hints.