Wow, this series has really knocked my socks off! I was told about it by a colleague who had watched the first one, and at the time hadn't watched the second. I downloaded the first episode from I-player, and on finishing it, immediately downloaded the other 5 available. I've watched all the 6 episodes shown in 4 days.Its brilliant. Very dark, atmospheric, and each episode so far has been a cliffhanger.It constantly twists and turns and I've no idea where it's going to end. I'll try and do the super sleuth like everyone else, but I'll be wrong as it seems everyone has a skeleton somewhere in their past- or present!The characters are very credible and likable and the moodiness of the lead detective is brilliant. An absolute gem hidden away on BBC 4, but I hope the quality continues and if it does it will be the best thing in ages. Think Cracker( for those old enough) come Broadchuch(Season 1-season 2- yuk!) come the killing( season 1. Brilliant.