Book recommendations for 12 year old who likes detective fiction

[Picturesinthefirelight]

She has enjoyed the Theodore Boone books & she loves the No 1 Ladies Detective agency.

She didn't like Agatha Christie. I think she's maybe a bit too young yet for my Colin Dexter collection

Any more recommendations for books of a similar type. I don't mind them a little bit gritty but not with gratuitous sex & violence.

[Booksteensmagazines]

Dead Time by Anne Cassidy -

Girl Missing by Sophie mcKenzie

Running Girl by Simon Mason is very good but maybe more for 13+ So just check the storyline

[BlueChampagne]

Sherlock Holmes of course!