During the chase, George bumps into the Gunner, a statue of a World War I soldier who helps him escape the pterodactyl and salamanders.
He explains to George that by breaking the stone dragon, he has entered a different world – an un-London – where statues move and talk.
The Black Friar identifies George as a maker, someone with a special gift for sculpting things from stone or metal.
The Friar also tells them to find the 'Stone Heart' and put the broken dragon carving back to make amends for the damage George has done.
George is seemingly rescued from Spout by Ariel, a spit who is also an Agent of Fate come to ensure he takes The Hard Way.
He is rescued from certain death on the end of the Knight's lance by the timely arrival of Spout who snatches him into the sky.
Although he has cheated death, the legacy of The Hard Way is inescapably carved into George's flesh, as three veins of marble, bronze and stone twine up his arm, each representing a duel to be fought.
Meanwhile, the Gunner has discovered that the Walker has killed many glints and stolen their sea-glass heart stone in his search for power.
He expects to die at midnight (turn o' day) but survives because George stands his watch on his plinth in his place.
Unseen by any of the others, but felt as an icy blast, an Ice Devil enters our world as the Walker exits it and follows them back to the present.
The arrival of the Ice Devil has frozen time and the city, which is disappearing under a heavy snow fall.
And the ordinary people seem to have disappeared, leaving George and Edie the only normal humans in a city now only populated by warring statues.
The Gunner is part of the Royal Artillery Memorial which was made by Charles Sargeant Jagger and stands in Hyde Park Corner.
The Officer One of the Spits who is part of the Royal Artillery Memorial and whom George meets as he stands on the plinth of the Gunner.
The statue, made by Percy Hetherington Fitzgerald is in Westminster at Aldwych & Strand behind St Clement Danes Church.
The Royal London Fusiliers Monument, made by Albert Toft, is on High Holborn, near Chancery Lane tube station and the regimental chapel is at St Sepulchre-without-Newgate.
The Grid Man statue is located in High Holborn at the Chancery Lane junction Minotaur – captures Edie but is killed by the plasticine bullet that George makes.
Stoneheart was shortlisted for the Branford Boase Award and longlisted for the Guardian Children's Fiction Prize.
[5] The Scotsman said the book was "thrilling stuff",[6] and The Times was highly positive, describing it as "intelligently and elegantly written, with pace and suspense, varied and convincing dialogue, and big themes of loyalty, sacrifice and emotional growth.
[4] In particular, Kirkus Reviews criticised the action for being "disappointingly dry",[7] and Publishers Weekly said it had a "protagonist who doesn't ring true.