The second original novel based on the hit Warner Bros. TV show Arrow and concluding the first crossover between The Flash and Arrow novels Continuing from the events of THE FLASH: THE HAUNTING OF BARRY ALLEN , team Arrow and team Flash seek to eliminate the bizarre energy that threatens to kill the Scarlet Speedster. Their quest takes them to Markovia, where they must get past an army of mercenaries and assassins to face the enigmatic Count Wallenstein.