Sara is suffering growing pains, and Hetty refuses to recognize that the 'Story Girl' is growing up. Gus has news of Captain Crane in Halifax, and plans to travel there to meet him. Sara meets a look alike named, Jo Pitts. When Sara finds living with Hetty unbearable, she forces Gus to take her to Halifax with him. Jo Pitts pretends to be Sara, with the help of Felix. Gus has been tricked by Abe Pike, not Captain Crane who sent the message and Abe wants Gus to take him to Captain Crane & the treasure, so he holds his captive until Gus captiulates, and in the meantime, nasty thieves believe that Sara is Jo Pitts, who is one of their own, and take her captive....