It's April 2020, and the Metropolitan Police are overwhelmed with messages hacked from the EncroChat network.

Buried among the millions of texts and photographs, are the outlines of a murder plot. An anonymous EncroChat user is trying to source a gun and some ammunition for a drive by shooting.

Will the police discover the messages before it’s too late? And will they be willing to risk the secrecy of the entire EncroChat operation by arresting someone on EncroChat evidence alone?

Presenter: Mobeen Azhar

Catching the Kingpins is a BBC Studios Production for BBC Sounds.