Preorder Size Seven
Agnes Triptoes is starting university early—and her first big story could be a murder mystery.
A new Agnes Triptoes adventure by Sarah Tucker
At sixteen, Agnes Triptoes is beginning her degree at Homerton College, Cambridge, two years ahead of most students. She is determined to earn a place on the college newspaper, The Homerton Homers. Then the Chancellor is found dead beneath his own portrait, and Agnes discovers a story no one can ignore.
The college is full of possible suspects. Everyone has a theory about what happened, but the clues refuse to fit neatly together.
Agnes has help from an extraordinary group of talking creatures. Professor Picklesworth the hedgehog, Neville the squirrel and their eccentric companions notice things the human investigators miss. Together, they follow the clues through Cambridge and begin to question whether the Chancellor’s death is quite what it seems.
Can Agnes uncover the truth by looking at the case from a different angle?
Full of talking animals, peculiar suspects and inventive humour, Size Seven is a mystery about curiosity, teamwork and the importance of perspective.
Paperback: £7.99
Approximately 28,000 words
Expected publication and dispatch: October–November 2026Preorder your copy — £7.99
Postage is calculated at checkout.
Why readers will enjoy it
Agnes Triptoes taking on a new mystery at Cambridge
An eccentric group of talking animal detectives
Curious clues, comic mishaps and plenty of possible suspects
A story about noticing small details and seeing things differently
Meet the team
Professor Picklesworth the hedgehog has an academic title and an eye for detail. Neville the squirrel is a surveillance expert with a flair for drama. They are joined by Sir Reginald Beakerton, Lady Cooington, Baron Fitzfoxington and Vicar Montague Slitherly—a group whose different talents prove surprisingly useful to Agnes’s investigation.
Working together may be almost as challenging as solving the case.
For curious young readers
The Size Seven pitch recommends the story for readers aged 7–9 who enjoy funny mysteries and talking animals. Readers who know Agnes from Size Six will recognise connections to her earlier adventure, while new readers can join her at the start of this case.
The story includes a death and a murder investigation, presented in a comic, fantastical style.
About Sarah Tucker
Sarah Tucker is a bestselling author, journalist and broadcaster. Her Agnes Triptoes stories combine curious characters, talking creatures and the pleasure of looking at a problem from a different angle.
Book details:
| Title | Size Seven: The Curious Case at Homerton College |
| Author | Sarah Tucker |
| Publisher | Cambridge Children’s Books |
| Format | Paperback |
| Price | £7.99, plus postage |
| Length | Approximately 28,000 words at manuscript stage |
| Suggested age | 7–9 years |
| Series | Follows Size Six |
| Expected publication and dispatch | October–November 2026 |
Preorder questions
When will my book arrive?
We expect to publish and dispatch preorders between October and November 2026. We will email customers if this timetable changes.
Do I need to read Size Six first?
This is a new mystery for Agnes. Readers of Size Six will recognise parts of her earlier story, but new readers can meet her here.
Can I order more than one copy?
Yes. Choose the quantity you would like at checkout.
