New Delhi, Sept. 13 -- Apple TV's new thriller Last Seen has made a strong early impression with viewers, but reactions suggest the six-part series may require patience from audiences expecting a fast-moving mystery.

The Australian drama, which premiered on 9 September, follows Ian Ridley, a former police detective whose life was shattered when his young daughter Maggie disappeared 11 years ago. Now working as an emergency dispatcher, Ian receives a distress call from a teenage girl he believes could be his missing daughter. That possibility is enough to pull him back into a search he never truly abandoned.

Early viewer reactions have been largely positive, although the show's pacing has emerged as one of the main points of debate.

One...