Unseen World


Ada Sibelius is twelve-years old and lives with her father David, a computer science Professor who is one of the most highly regarded academics in his field. Ada is home-schooled: surrounded by her father’s colleagues in the lab, her days are spent with brilliant minds, her childhood idiosyncratic yet idyllic. That is until David begins to forget things. At first he can’t remember the punchlines to his favourite jokes but soon he is disappearing from home for days on end with no memory of how he spent his time. Diagnosed with Alzheimer’s, Ada’s close bond with her father is shattered within an instant and she must navigate her teenage years without her father’s guidance.

Peek Inside

In stock

Check the box below to add a card to the basket. Please use ‘Notes’ to indicate occasion and your message

Do you feel this product is perfect for a friend or a loved one? You can buy a gift card for this item! Gift this product
SKU: 9780099510734 Category: Tag:


‘A staggeringly beautiful meditation on love, legacy and the emotional necessities that make life worth living.’ Téa Obreht, author of The Tiger’s Wife

BOSTON, 1980

Ada Sibelius is twelve years old and home-schooled. Her days are spent in a lab with her father David, a computer science professor, and the brilliant minds of his colleagues.

David is widely regarded as one of best in his field. That is, until he starts to forget things.

When David is diagnosed with Alzheimer’s, Ada’s world falls apart. But when he leaves a floppy disk for his beloved daughter, she has no idea that the coding within it holds the key to a past that her father refused to talk about. Navigating her teenage years without his guidance, will Ada be able to piece together the father she lost?

Read a sample here

Additional information

Weight 367 g
Dimensions 19.8 × 12.9 × 2.8 cm










813.6 (edition:23)


General – Trade / Code: K

Join Waitlist We will inform you when the product arrives in stock. Please leave your valid email address below.


This product has been automatically created by the plugin YITH Gift Cards.You must not edit it, or the plugin could not work properly. The main functionality of this product is to be used for the feature "Gift this product"