Ring of Fire is the English translation of L'anello di fuoco, the 2006 Italian fantasy novel for young people written by Pierdomenico Baccalario, with illustrations by Lacopo Bruno.
[1] The English translation by Leah D. Janeczko was published in New York by Random House, in 2009 (ISBN 9780375858956).
Book Two, Star of Stone (ISBN 9780375858963), set in New York City, was published in English in 2010.
The children are destined to become involved in a mystery involving a briefcase and five tops which contain clues leading to ancient mystical artifacts, a mystery that will bring them all into peril, a race to find the ancient mystical artifacts first and to avoid death.
They criticized the characters as being underdeveloped, but did state that the book has an intriguing premise and some exciting moments.