The police investigation enters a new phase when DI Cadi John and DS Owen Vaughan are called to the scene of a potential kidnapping in the middle of the night, and their concerns that a serial kidnapper is on the loose are confirmed, but a shocked Lowri Driscoll isn't able to offer any information about the identity of her attacker

Dylan Harris has an explosive outburst at Carn Ddu quarry after he is sacked, which leaves his boss Delyth Hughes worried about his mental health. And two worlds collide when Cadi's sister Elin treats Dylan's wound in the hospital.

Student Megan Ruddock also struggles with mental health issues, and when a seemingly inconsequential incident tips her into panic, she makes a fateful decision which changes her life forever. Show less