Erin is determined to raise some cash for the struggling local community centre by organising a charity fete. But then a young woman called Amy turns up in Hawley, announcing that she is Erin's half-sister. Reeling from the bombshell, Erin welcomes Amy in as they plan the fete together and go on a girl's night out, but is Amy everything that she claims to be? Meanwhile, Vinnie and the lads plan a heist of the botanical gardens to steal a rare and valuable rose.