There are 4 books in the Charlotte Holmes series. The newest book is A Question of Holmes which came out in 2019.

1
A Study in Charlotte

Book cover of A Study in Charlotte

The first book in a witty, suspenseful new series about a brilliant new crime-solving duo: the teen descendants of Sherlock Holmes and John Watson. This clever page-turner will appeal to fans of Maureen Johnson and Ally Carter.

Jamie Watson has always been intrigued by Charlotte Holmes; after all, their great-great-great-grandfathers…

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2
The Last of August

Book cover of The Last of August

In the second brilliant, action-packed book in the Charlotte Holmes series, Jamie Watson and Charlotte Holmes are in a chase across Europe to untangle a web of shocking truths about the Holmes and Moriarty families.

Jamie and Charlotte are looking for a winter break reprieve in Sussex after a fall…

3
The Case for Jamie

Book cover of The Case for Jamie

The hotly anticipated and explosive third book in the New York Times bestselling Charlotte Holmes series.

It’s been a year since the shocking death of August Moriarty, and Jamie and Charlotte haven’t spoken.

Jamie is going through the motions at Sherringford, trying to finish his senior year without incident, with…

4
A Question of Holmes

Book cover of A Question of Holmes

In the explosive conclusion to the New York Times bestselling Charlotte Holmes series, Holmes and Watson think they’re finally in the clear after graduating from Sherringford…but danger awaits in the hallowed halls of Oxford.

Charlotte Holmes and Jamie Watson finally have a chance to start over. With all the freedom…