https://www.amazon.co.uk/Mathematics-Its-History-Undergradua... by Stilwell
Which is a history of mathematics but with serious examples to work on, and may appeal to self-study maths fans.
https://www.amazon.co.uk/Mathematics-Its-History-Undergradua... by Stilwell
Which is a history of mathematics but with serious examples to work on, and may appeal to self-study maths fans.