When she suddenly has to leave all that behind and move to London, with only an eccentric uncle for company, Fern feels entirely uprooted.

But when she meets a little plant that can understand her every word, it seems that things are looking up! That is until strange things start happening in the city: giant lily pads on the Thames, monkey vines on the London Eye, and now her new friend is starting to wilt.

Can they solve this growing mystery together - before it's too late?