Zinnie and her "sisters" lived in the murky tunnels of Edinburgh and find throughout the book more people are living in these particular tunnels. So Zinnie decides to investigate . I won't go into what she finds as it would be a complete spoiler for the rest of the book and I do not do spoilers of any kind. I will say that there are a plethora of characters including Conan Doyle when he was studying and a female Dr. I loved that Sharon had such strong female characters in an era where women and girls did not have the same freedoms as their male counterparts. I thoroughly enjoyed The House of Hidden Wonders by Sharon Gosling and I wish to thank Netgalley and Little Tiger for letting me review this wonderful book. For these reasons I had to give 4 stars.