When a journalist disappears while working on an exposé about an innocent man serving time for murder, Danny and Baez hope that reexamining the original case will help find her. Also, Frank reluctantly speaks out against an initiative led by Erin’s office to consider drug abuse as a disease first, and a crime second.

Rebecca wonders if history is repeating itself as Darryl embraces a newfound superpower and Paula schemes again, this time for good.

When Mac and Jack are trapped inside Mac’s house, which his nemesis, The Ghost, has rigged with explosives, Mac uses a karaoke mic and an audio transformer to let the team know that this bomb is a distraction for a bigger one. Also, through flashbacks, Mac and Jack’s contentious first meeting unfolds.

With Daisy’s life on the line, an unexpected friend attempts to rescue her.

Sandi Toksvig looks into some origins and openings, with Josh Widdicombe, Susan Calman, Rich Hall and Alan Davies. Tune in to hear what Mr First thought of Mr Second, and much more.