Bad Luck and Trouble by Lee Child
From a helicopter high above the Californian desert, a man is sent free-falling into the night. On the streets of Portland, Jack Reacher is pulled out of his wandering life and plunged into the heart of a conspiracy that is killing old friends… and the people he once trusted with his life.
Reacher is the ultimate loner – no phone, no ties, no address. But a woman from his old military unit has found him using a signal only the eight members of their elite would know. Then she tells him a terrifying story about the brutal death of a man they both served with. Soon Reacher is reuniting with the survivors of his team, scrambling to unravel the sudden disappearance of two other comrades. But Reacher won’t give up – because in a world of bad luck and trouble when someone targets Jack Reacher and his team, they’d better be ready for what comes right back at them.