The two-part crime drama, a follow-up to the 2007 series Five Days starring Hugh Bonneville, averaged 5.4m (20.8%) in the 9pm hour.
It was beaten by ITV1's Wild At Heart, which averaged 7.15m (26.6%) from 8.30pm.
Dancing On Ice added around 800k in its second week on air, ranking as the most-watched programme of Sunday. The performances show, broadcast over 80 minutes from 7.10pm, pulled in an impressive 9.19m (34.3%), then the later results show - in which soaps actress Gemma Bissix was voted off - managed 6.72m (26.1%) from 9.30pm.
Earlier, a screening of animated sequel Ice Age: The Meltdown averaged 5.66m (25.5%) between 5.25pm and 7.10pm.
Antiques Roadshow drew 6.98m (26.5%) to BBC One in the 7pm hour, then a new episode of Lark Rise To Candleford had 6.07m (22.3%).
On BBC Two, live coverage of the snooker Masters final - eventually won by Ronnie O'Sullivan - averaged 2.6m (13.4%) over more than four hours from 8pm. The channel averaged 9.8% in primetime, a fall of 2.5 points on last week.
A rerun of documentary Half Ton Son appealed to 1.65m (6%) for Channel 4 in the 8pm hour, then the latest Celebrity Big Brother update had 2.18m (8.5%). Catherine Tate's hosting of the Sunday Night Project was seen by 1.4m (7.9%) from 10pm. Overall, C4 averaged 6.5% in primetime.
Five had 968k (3.5%) for Ice Road Truckers in the 8pm hour, then Mel Gibson thriller Payback kept 1.23m (5.5%) until 11.05pm. The channel averaged 4.7% between 7pm and 11pm.
Comedy movie The 40 Year Old Virgin brought in 702k (3.7%) to ITV2 from 9pm, plus 151k (1.2%) on ITV2+1. Earlier, a repeat of Saturday's Demons snagged an impressive 506k (2%) and 125k (0.5%) on timeshift.
More4's Come Dine With Me marathon peaked with 843k (4.2%) for its 6.15pm episode.
> Saturday Ratings: ITV's 'Demons' drops to 4.2m
> Friday Ratings: 3.1m turn out for Malone's BB eviction
> Interview with Hunter's Hugh Bonneville
Ratings data supplied by Attentional