Thunderbirds - 2 is a tie-in book based on the classic television series Thunderbirds. The "2" suggests a second installment or a focus on the show's iconic character, Thunderbird 2, the massive transport aircraft piloted by Virgil Tracy. The book, likely a novelization or choose-your-own-adventure format by Dave Morris, would feature International Rescue saving the day in a high-stakes, technologically advanced scenario.