The drama, about a modern-day copycat of Jack The Ripper, averaged a very strong 7.61m across its three-part run, making it one of ITV1's most successful shows of the year to date.
It beat BBC One's Who Do You Think You Are? - this week featuring Rick Stein - with 5.45m (21.6%) in the hour.
BBC Two's three-part crime drama Moses Jones, starring future Doctor Who lead Matt Smith, bowed out with a miserable 1m (4%).
Channel 4 doc The Gangster and The Pervert Peer, about criminal twins the Krays, drew 1.24m (4.9%) and Five movie Windtalkers kept 1.15m (6%) until 11.35pm.
The second University Challenge semi brought in 3.64m (14.4%) to BBC Two at 8pm, then a new week of MasterChef began with 3.92m (15.2%).
Channel 4's Dispatches: The Big Job Hunt, detailing rising unemployment in the UK, had 970k (3.8%) in the 8pm hour and on Five, Fifth Gear appealed to 838k (3.3%).
Two visits to Coronation Street brought in audiences of 9.91m (41.2%) and 10.04m (38.9%) at 7.30pm and 8.30pm respectively, while BBC One's EastEnders put in 9.59m (37.9%) at 8pm. Emmerdale took 7.59m (34.2%) at 7pm.
Hollyoaks picked up 1.9m (8.9%) for Channel 4 at 6.30pm, and on Five, Neighbours had 1.7m (10.5%) and Home & Away had 1.1m (5.6%).
ITV1 dominated primetime with an average share of 27.8% to BBC One's 22.1%. BBC Two was third with 7.8%, while Channel 4 lagged with a miserable 4.4% (+1: 0.7%). Five was in last on 3.8%.
Sky1's 24 took a reduced 448k (2%) in the 9pm hour, beaten by a Gavin & Stacey repeat on BBC Three with 544k (2.4%) over 30 minutes.
Elsewhere, America's Next Top Model interested a decent 410k (1.8%) for Living at 9pm.
Ratings data supplied by Attentional