This idea started off as a pitch for a graphic novel, but it never gained any steam.
In a world where metal is a rare resource, metalmancers, or children born with an innate ability to shape and control metal with their minds are highly valued.
Sisters Mand and Val share this power. While Mand can bend a shape metal, Val has an understanding of gears and is able to program any construct her sister can create.
Running from a dark past, the two travel the roads, doing odd jobs here and there to make a living. However, news arrives that metalmancers are starting to disappear, abducted by a shadowy organization for some unknown purpose...
Mand and Val are about to be drawn in.