Ava Smith is an ordinary ten-year-old girl with an ordinary father and two seemingly ordinary siblings... but one day a hovering hand and a mysterious key appear, changing the lives of the Smith children forever. To save the people she loves, Ava must embark on a remarkable adventure with a talking cat, a peculiar clock, and a growing list of strange family members, who teach Ava that sometimes the bravest thing she can do is be herself.