When a visitor from home arrives in Hope Valley, Elizabeth begins to question the direction of her heart and feelings for Jack. As Abigail struggles with how to help her daughter-in-law, Bill delves deeper into an undercover investigation.

Do Rome's ancient monuments have secret connections to the Sun? New archaeological evidence, confirmed by NASA data and recreated in state-of-the-art virtual reality, suggests that early Roman emperors mastered architecture and astronomy to make the Sun create strange special effects for reasons both political and personal. One set up an obelisk and altar that blocked the Sun on the anniversary of Julius Caesar's murder, another built a domed room that bathed him in sunlight on certain days, and the Emperor Hadrian designed the Pantheon to mark cosmic events like equinoxes, and turned the central "oculus" of the temple dome into his own personal spotlight, but for what nefarious purposes? We uncover the last great mysteries of the ancient world's greatest empire. The answers are hidden in ancient ruins... and among the stars.

Paul digs and finds the ugly truth behind the Castor Boys' logbooks of names, pushing him into action. Meanwhile, Felix is desperate for info on Sarah's whereabouts, and presses the still-ailing Rachel for any shred of a lead. In order for Donnie and Alison to take their money-making endeavor to the "next level" she must introduce Jason Kellerman to her unique business plan.

Lady Penelope, Parker and Gordon visit the Amazon desert, where an archaeologist shows them round an ancient temple. When they all become trapped inside, the academic refuses to let them call for help, fearing for his reputation - so the trio of heroes must put their wits to the task of finding an escape route.

In a very special episode, the Queen of the Australian kitchen, Maggie Beer returns to the MasterChef Australia kitchen as the 19 contestants face another mystery box challenge.

Hulk follows Leader back in time to the Victorian era and unites the Howling Commandos against Dracula, who wants to shroud the Earth with Leader's gamma cloud, allowing vampires to prey night and day.

Mr Norrell's magical illusions manage to baffle the French Navy and secure him the loyalty of Sir Walter Pole. Some magic he has used to revive Lady Pole has released something unnatural into Sir Walter's home. Jonathan Strange's magical ability increases and he travels to London take up an apprenticeship with Mr Norrell.

Miriam fears the consequences of David learning the truth, while Steph hides a secret that threatens the farm's future. Teresa's past comes back to haunt her in the shape of an unexpected visitor who could ruin her new life. Kate and Jack make plans for the future, and Laura's jealousy complicates her relationship with Richard. Erica struggles to save Bob and Pat's marriage, and Claire is caught in the crossfire between Frances and Joyce as plans get under way to build a new air raid shelter for the village.