Diamonds In The Shadow - The Wallace-Adhikary Spy-Thrillers, #4

When a billion-pound shipment of diamonds vanishes en route to secure the global oil markets, disgraced MI6 agent Rupert Wallace is sprung from a remote prison to lead the dangerous recovery mission. Aided by the brilliant Adhikary family, Wallace pursues the shadowy forces behind the Nexus crime syndicate across the globe in a relentless crusade for justice. From the steamy jungles of Colombia to the snowbound peaks of Russia, Wallace and his allies leverage cutting-edge technology and old-fashioned courage to infiltrate Nexus at every level.
But the mysterious Colonel pulling the terrorist group's strings always seems one step ahead, unleashing exotic new weapons from secret Arctic bunkers. When Nexus launches an experimental wormhole, Wallace realizes greater threats loom ahead now that Earth has drawn the attention of alien warlords. Though Nexus suffers terminal blows, he knows the encroaching darkness is just beginning. But his resilient team vows to face the interstellar invasion together, ready to defend humanity no matter the cost in their unending battle for justice.
The game is on to save mankind from its greatest challenge yet!