The first series of Ripper Street concluded on Sunday with an average audience of 5.1m viewers and an audience share of 20.1%.
The ITV1 drama fightback began this week with three new dramas making their debuts.
The return of an old favourite on BBC One means that the corporation has had another good week in relation to its competitors.
This week saw the schedules get back to normal as the BBC waved goodbye to the Olympics and several new shows were launched.
Based on a screenplay developed by J. J. Abrams and Jonathan Nolan, Person of Interest aspires to be complex, but ultimately fails to be so.