Strangers is on ITV at 9pm.

First episode of a gripping eight-part thriller, starring John Simm. A Professor’s life is turned upside down when he is informed that his wife has been killed in a car crash in Hong Kong.

Travel Man, 48 Hours in Zurich is on Channel Four at 8.30pm.

Return of the travel series. Richard Ayoade is joined by comedian Frank Skinner for a short break in Switzerland.

Reported Missing is on BBC One at 9pm.

This edition follows the hunt for a 49-year-old man from Crewe, who vanished after telling his wife he was going to the job centre.

Black Earth Rising is on BBC Two at 9pm.

This eight-part thriller stars Michaela Coel and Harriet Walter. A legal investigator takes on the prosecution of a Rwandan militia leader.

QI is on BBC Two at 9pm.

Return of the light-hearted quiz. Host Sandi Toksvig welcomes guests Phill Jupitus, Teri Hatcher and Danny Baker.

The Undateables is on Channel Four at 9pm.

Return of the series following disabled people who are searching for romance. Tonight’s edition features a woman with Asperger’s who has just finished her degree.

The Assets is on Alibi at 10pm.

Nightly fact-based thriller set in the 1980s, starring Jodie Whittaker. A CIA officer tries to save Soviet intelligence officers from being exposed by a mole within her own agency. Continues tomorrow night.