Plot summary
An infant is found dead in his cot, it is suspected that the baby died of cot death. However, when it is revealed that the baby died as a result of being shaken, Brooks and Devlin initially suspect the live-in nanny, especially after she admits to being the only person around the baby in the 24 hours preceding his death. Things begin to get complicated, however, when it is discovered that other people were in the house that day. The live-in nanny's boyfriend soon falls under suspicion, as his rough attitude with his four-year-old nephew has come under suspicion from social services. However, it soon becomes clear that the nanny may have been having an off-day, and a quick reaction to a minor incident may have caused the fatal move.
Credits
Adapted from Wikipedia contributors, Law & Order: UK series 4. HTML formatting and reference markers removed.