Julia Golding books in order
3 books in the catalogue, about 23 hours of reading in all; the shortest takes 7 hours and the longest 8 hours.
1 series in the catalogue.
Cat Royal
5 books Cat among the Pigeons length not known
The Diamond of Drury Lane 8.2 h 
Den of Thieves 7.6 h 
Black Heart of Jamaica 6.9 h Cat O'Nine Tails length not known