Amber arrives back in Shieldinch, but not everyone is happy to see her return. Lenny receives some grave news that affects his health. AJ attempts to reignite the spark in his marriage, but Annie's growing attraction to Alex leads her to question her commitment to AJ. Meanwhile, Robbie takes drastic action to better his life, leading to a big decision that will affect his future in Shieldinch. Will he take the leap?