A moment of darkness, a moment of light - and a vision of What Could Have Been.

Franz sends Maximilian on a diplomatic mission to make an ally of Napoleon III. Sophie schemes to side-line Elisabeth and take charge of her children.

Ava investigates a crime scene and runs into an old friend; Nathan takes a risk seeking redemption.

You can't go home again.

With some help from Cece, Caroline and Blaise ally to secure Scott's presidential run. Lucien and Annie play hooky. Beatrice celebrates her anti-greek victory with plans for more.

Michel and Rami start building their team, while Detective Chief Inspector Leonie Hamsik gets into trouble at work.

Charles has some explaining to do when Emily unexpectedly arrives in town - and another missing item lands him in Elliott's cranky crosshairs.

When Ray brokers a deal for Furstenburg Gray to buy out Gruber & Fisk, Helen is plunged into crisis.

Tess and Claud return with the results as our couples find out who has made it through to next weekend's musicals special. And two more couples go head-to-head in the dance-off.

A rising in the north destabilises Henry's kingdom. Despite the risks to his own life, Cromwell moves to protect Lady Mary from becoming the rebels' greatest prize.