New Year's Eve celebrations are cut short when a masked man stabs a woman in her own home.
The Lyell team investigate the fatal crash of a private jet carrying an American diplomat.
In 1960s London, model Christine Keeler deals with an explosive love triangle.
Naturalist Chris Packham investigates the impact of our growing human population.
The nine home cooks make ultimate meringues before rustling up amazing vegetable dishes.
This week's auditions feature ballet, Afrobeats, ballroom and tap dancers.