An administration error sees the life of a young boy hanging in the balance and leads to Adam and Tess clashing but should they be pulling together in a time of crisis? Lenny is shocked when Mads reveals that she's engaged but when she and Lenny come close to kissing and she then hails a taxi, has she made a decision that she will regret? Ruth (with Charlie's support) makes a surprise return to the department but during all the chaos, will she fail at the first hurdle? (thetvdb.com)