Please help me find the title!

[snaregirl]

I read this book a couple of years ago and I think it's YA. It's about a teenage girl who tries to steal gold from a building with the help from her techy guy friend. I remember that she had to coat herself in something cold so she wouldn't be detected by the security cameras. At the end, the gold was at the top of the building. I think "heist" was in the title, but I'm not too sure. Thanks