When Kelby's old friend Emily becomes the target of threatening texts, the team must act fast to uncover who's hiding behind the screen. With Humphrey busy at home, Kelby steps up to help Esther with the investigation, facing endless potential suspects as they delve into the world of social media and online spats. Meanwhile, Humphrey and Martha have a rocky start as they welcome Rosie - their new foster child - into their home and grapple with how to best care for her. Elsewhere, new relations are formed as Esther finds herself in a surprising romantic entanglement and Anne finds solace in an unlikely friend when rocked by a potential health scare.