So, on the one hand you have accurate historical background on Babbage and Lovelace and the work they did together.
And then there are the fantastical steampunk adventures they might have had if only they'd gotten around to making the first computer. The adventures are as heavily footnoted as the real history, so one can learn a great deal about the historical figures, the process of digging through history for evidence, and more. Great fun for all ages, although the really young would need an advanced reader to help.
Library copy