Book with iron in the title about a boy who breaks a statue in a museum and is suddenly able to see walking statues [s]

[Anonymous]

I can't remember what is mentioned on the back and what would be a spoiler so I'm putting it all in it. (view spoiler)[boy-finds-out-he-is-a-maker-and-needs-to-put-things-right-by-giving-some-sort-of-heart-to-someone/thing-on-his-journey-he-meets-and-becomes-allies-with-a-statue-named-Gunner-I-think-and-a-girl-who-can-also-see-the-statues-who-in-the-third-book-you-find-out-is-his-sister.-The-boy-lived-only-with-his-mother.<\spoiler> (hide spoiler)]

[Isabel (kittiwake)]

You don't need to worry about spoilers in this group, as they are what may help someone identify your book.

[Serena]

Stoneheart next book in series is Ironhand.

[Anonymous]

That's it! Thank you!