A peculiar abduction in Boston leads the team to uncover details of the mysterious man known as the Observer; Walter, Peter and Astrid analyze unusual evidence and deal with Walter's insatiable appetite for milkshakes.
Abigail gets in over her head when she agrees to defend a friend who is anti-vaccine; Daniel is bitter over Harry's rejection of his partnership proposal; Nico gets suspended for forgery, forcing Abby and Frank to reconsider their parenting plan.
The lawyers are bewildered when a young couple begs them to reverse an adoption after learning about the baby's serious health issues; Abigail determines that the father is driving the decision, and convinces the mother to fight to keep the baby.
Still reeling from the discovery of Frank's continued affair, Abby sets out to get justice for a debt-ridden widow whose husband may have faked his own death.
The lawyers represent a mail-order bride whose husband wants to annul the marriage and have her deported.