SOLVED. A book where two people can control fire, and are put in jail. Dictatorship in a country that isn't a dictatorship in the future(?) [s]

[Anonymoose]

Hey. Thanks for clicking on this post. Today I'm trying to remember a book I read back in 2013. It was about a girl (Teen, 14 I think.) and her brother (15, I think.). They are put in jail for an unknown reason, where they learn they can control elements, starting with fire. It is a 4 book series about their adventures. This is all I can really remember, so I desperately hope this is enough for you to know what book it is.

Cheers,
Anonymoose

[Lobstergirl, au gratin]

Moving to Unsolved.

[Anonymoose]

Some more things I remember about it: They can go through walls, there may be a risk involved (Dematerialisation if they're in it for too long?), and only certain walls work.

Massive Spoilers if you want to read this series after I know what it is

Third book there's a plague of some sort

Fourth book the girl is in love with someone who turns out to be one of the villains from the first book in disguise

[Sue]

Witch And Wizard series by James Patterson?

[Anonymoose]

That's the one! Thank you so much!

[Kris]

Note: Shelved as Witch & Wizard by James Patterson, the first book in the series "Witch and Wizard".