I challenge you to tell me what this show is!

[Optimist1]

Heatwave obviously affecting my brain at the moment. Within the past week I read about a show that I thought would appeal to me and remember thinking I could catchup online. I believe it was a one-word title, possibly beginning with U. I'd be attracted by crime/thriller/legal/contemporary drama and wouldn't turn my nose up at a subtitled programme. What was it I read about, please, MNers?

Thanks for all your suggestions; some look promising. I thought I'd let you know that it was Unsolved - 8 episodes available on iPlayer. (Very relieved that it actually did start with U!)