The Secret of the Ruby Elephant is the second installment in the Martin McMillan middle-grade series (ages 8-13). Thirteen-year-old Martin and his friend Isabel skate their way through this fast-paced adventure, traveling from Chicago to Thailand to solve the theft of the Ruby Elephant. The 15th century Thai statue is part of a mysterious legend that holds the secret to a hidden treasure. The friends must decipher a complicated puzzle of clues from Buddhist symbols and ancient ruins, as they track down the thieves and try to stay out of harm's way.