Dr. Hope Martin first appears in "Throwing Down the Gauntlet".
Hope's daughter Cailin is suffering from a kidney disease from all the traveling that Hope and Calin did. She discovers that Maura is her biological daughter and reacting badly, calls Maura a liar and assumes that she is after something. (Money Maker)
Hope contacts Maura asking for her to donate her kidney to Cailin. Hope arrives to the BPD unannounced and sees Angie. They talk and Angie tells her how Maura is "Her business", asking if she is only back to get Maura's kidney. She replies yes. Maura tells her to get an appointment to meet with her, but Hope ignores her and goes to meet her anyway. Maura asks her to leave though. During the chaos of the building collapse, Hope comes to help the injured. At the end of the episode, Maura agrees to give Cailin her kidney, but only if Hope promises to never tell her. (No More Drama in My Life)
She shows the same level of compassion for her job as her daughter Maura, both believing that they are incapable of saving people but can speak for the dead with their profession.