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.