For those in search of something to watch during this betwixt-and-between TV season, I’d recommend “Broadchurch,” a British-made murder mystery showing Thursday nights on BBC America (and available on demand). It’s an eight-part series, starring David Tennant (“Dr. Who”) and Olivia Colman (“Hyde Park on Hudson” and many British TV shows) as a mismatched pair of detectives investigating the death of an 11-year-old boy in a small seaside town. (Yes, there’s a bit of an Inspector Lynley/Sergeant Havers vibe going on.) Based on the first episode, “Broadchurch” is something like “The Killing,” but better: a brooding tale of the effects of a crime on a family and a town, and a step-by-step search to find a killer in a place that seems idyllic. Looks like everyone’s got a few secrets (hmm, where do you think the boy’s dad was that night?), particularly Tennant’s officious Detective Hardy. Can’t wait for the next installment . . .