That Time in Sydney : A Wolfgang Pierce Thriller(Wolfgang Pierce‪)‬

Saving the world makes you a hero-and a target.
After a tragedy befalls his team, Wolfgang is on the hunt to find the people responsible and bring them to justice. The search will take him to some unlikely places, while old secrets and decades of deception make even his closest friends appear like potential enemies.
When everybody is in the business of subterfuge, who can you really trust?
Wolfgang will have to decide quickly, because more is at stake than his hunger for revenge. Another terrorist attack is in the works, and this time Wolfgang is the only person on the planet with the knowledge and ability to stop it.
And he may be too late.