Christine is made acting consultant in Robert's absence. Mike battles to save the life of a drowned child, but the father's attempts to hide the truth surrounding the boy's accident make it harder for him to administer the correct treatment. Stuart and Louise deal with a case of domestic violence involving a severed finger. David's latest attempt to bring the department up to speed with cutting-edge technology leaves him with egg on his face, and Mike is shocked by the arrival of an unwelcome visitor: his ex-wife, Stella.