This is the third book in the Sally Lockhart series and is a little more dramatic than The Shadow in the North. Set a few years later, Sally has a daughter, Harriet, and they are living happily in a new home. But someone is claiming to be Harriet’s father even though he died a few years before and he wants custody of her. So now on the run, Sally vows to make sure to keep Harriet and with the help of the mysterious Dan Goldberg this is one of the toughest battles she’s fought in her life.