Following the storm, a mudslide causes many injuries; Meredith faces a decision that will impact a loved one; Callie is rocked by Arizona's infidelity.
Caroline spends a night with Andy, but finds herself in a panic when she develops a terrible rash the next morning, Max has a theory.
Danny's ex-wife returns. Having read a letter he hadn't meant for her to see, she tells him that she wants to make things work.