There are 5 books in the Her Majesty the Queen Investigates series. The newest book is The Queen Who Came in from the Cold which came out in 2025.

1
The Windsor Knot

Book cover of The Windsor Knot
For fans of The Crown and The Thursday Murder Club by Richard Osman.
On a perfect Spring morning at Windsor Castle, Queen Elizabeth II will enjoy a cup of tea, carry out all her royal duties . . . and solve a murder.

'Like an episode of The Crown -…
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2
All the Queen's Men

Book cover of All the Queen's Men

“Sheer entertainment… Bennett infuses wit and an arch sensibility into her prose… This is not mere froth, it is pure confection.” — New York Times Book Review on The Windsor Knot

Amateur detective Queen Elizabeth II is back in this hugely entertaining follow-up to the bestseller The Windsor Knot, in…

3
Murder Most Royal

Murder Most Royal
THE ROYALLY BRILLIANT THIRD BOOK IN THE HER MAJESTY THE QUEEN INVESTIGATES MYSTERY SERIES - NOW AVAILABLE IN HARDBACK, EBOOK AND AUDIOBOOK!
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December 2016 - A severed hand is found washed up on a beach next to the Queen's estate at Sandringham.

Elizabeth has become quite accustomed to solving…

4
A Death in Diamonds

Book cover of A Death in Diamonds

THE ROYALLY BRILLIANT FOURTH BOOK IN THE HER MAJESTY THE QUEEN INVESTIGATES MYSTERY SERIES - NOW AVAILABLE IN PAPERBACK, EBOOK AND AUDIOBOOK!
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1957 - Young Queen Elizabeth II is finding her way in a challenging world as the United Kingdom must adjust to having neither an empire nor a…

5
The Queen Who Came in from the Cold

Book cover of The Queen Who Came in from the Cold

It's 1961 and the Queen is planning her state visit to Italy aboard Britannia. But before she goes, an unreliable witness claims to have seen a brutal murder from the royal train. Did it really happen, and could the victim be a missing friend of Princess Margaret's new husband, Tony…