If you enjoyed HP, I can heartily recommend a trilogy by Charlie Fletcher called Stoneheart, Ironhand and Silvertongue which feature 2 14 year olds, male and female, set in an alternative London. There is some action to keep the stories fast flowing, but similar to that of HP.
I would have thought these would be RIGHT up your street. My 13 yr old is on the 3rd book at present and loves it. You will never look at London in the same way again! Magical, without it ever being referred to as 'magic'. What happens just 'happens' in this alternate London layer.
Also, if you have never seen them, try the 'Tunnels' series (think it is now 4 books) and Inheart/Inkspell/Inkdeath.
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