They say you can't help who you fall for, but a woman in the Witness Protection Programme - really, Tim, really? The lovesick sleuth is asking for trouble and it falls to best bud Chris and ex-wife Judith to sort out the sticky situation. Marcus is an extraordinarily gifted child, master of many subjects and skills, except, we learn this week, riding a bike. Find out if the youngster perfects the pastime or risks experiencing the social stigma that unavoidably comes with stabilisers. (thetvdb.com)