Paapa Essiedu may soon be set to don the dark robes of Severus Snape in HBO’s “Harry Potter” series, but the British actor will first be getting into the black cloth of the clergy.

Keeley Hawes and Paapa Essiedu have been confirmed as the leads of new Channel 4 drama Falling, which has been penned by Adolescence writer Jack Thorne. The six-part series – which has just ...