The holiday is turned on its head when Kate intercepts Sean's text messages and suspects him of having an affair. Wrapped up in her fears of betrayal, she fails to notice that Lucy is ravelled up in a mysterious situation with Jenny's dysfunctional son Jake.

Alistair makes a shocking discovery while snooping on Jake's phone. At Kate's birthday party, things are brought to a head when Alistair's offer of support to Lucy is misconstrued. Escaping the adults, the children head out to the scrubland, where disaster unfolds.