The second episode of the series, which stars Martin Shaw as a priest who practices exorcisms, drew 2.88m (12.6%) to BBC One in the 9pm hour. Last week the drama opened with an encouraging 4.62m (20.6%).
Apparitions lost out to the might of I'm A Celebrity, which pulled in an impressive 8.05m (35.5%) for ITV1 between 8pm and 10pm.
Earlier on BBC One, the latest episode of Little Dorrit drew 3.81m (17%) at 8pm, then The People's Hospital brought in 2.43m (10.6%).
BBC One had the most-watched show of the day with EastEnders, which pulled in 8.1m (38.2%) at 7.30pm. ITV1's Emmerdale managed 6.95m (34%).
Hollyoaks picked up 1.71m (8.5%) for Channel 4 at 6.30pm (+1: 60k, 0.3%), then E4's first-look appealed to 595k (3.4%) at 7pm (+1: 211k, 1.1%). On Five, Neighbours had 1.48m (9.4%) at 5.30pm then Home & Away averaged 1.02m (5.5%).
On Channel 4, A Place In The Sun: Home Or Away logged 1.31m (5.8%) for the 8pm hour. At 9pm, Special Needs Pets - a documentary about depressed parrots and rabbits in wheelchairs - intrigued 1.73m (7.6%).
Five's Secrets of Egypt brought in 1.26m (5.5%) at 8pm then a new episode of Danger Men interested 871k (3.8%).
ITV1 was up significantly week-on-week in primetime, with an average share of 28.4% (last week: 18.5%). BBC One was down from 22.5% to 19.5%, while BBC Two was up from 7.1% to 7.5%. Channel 4 tumbled from 10% to 6.2% and Five fell from 5.4% to 4.5%.
BBC Three's repeat of EastEnders was the day's top multichannel programme, with 687k (4%) from 10pm. Sky1's Bones was second, with 652k (3.2%) in the 9pm hour.
BBC Four's Timeshift: The Last Days Of Steam had a strong 535k (2.6%) in the 9pm hour and on ITV2, I'm A Celebrity, Get Me Out Of Here Now! had 497k (3.2%) from 10pm (+1: 41k, 0.5%).
Ratings data supplied by Attentional