Neil Oliver joins the crew of the last surviving coal fired, steam-powered, "Clyde Puffer". Amateur artist Alice Roberts explores what drew Joan Eardley to Catterline and how her life was cut tragically short on the verge of great success. Nick Crane reveals how the majestic Loch Ness became part of Britain's biggest building project in the early 1900s. Miranda Krestovnikoff dives into Loch Creran to explore how the tiny worms built a giant reef known as Worm City. Hermione Cockburn visits the "Islands that Roofed the World" and Mark Horton unearths what remains of the mysterious and violent people who once ruled much of Scotland, the Picts.

• Alice Roberts
• Miranda Krestovnikoff