Why does Wade become the sisters' driver?

To fulfill a promise to Captain Whitmore, who died saving him.

What threat unites Wade and the sisters?

Vivian's fiancé Blake is poisoning their grandmother and hunting them.

Bulletproof Driver

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Bulletproof Driver — An unkillable soldier fakes his death to protect three sisters as their late father's driver.

Wade Callahan survives any injury thanks to a covert military program. When Captain Frank Whitmore dies shielding him, Wade stages his own end and takes a job driving Frank's three daughters. The sisters resent his presence until they discover Vivian's fiancé Blake is systematically poisoning their grandmother while targeting the siblings. Keeping them alive forces Wade to reveal his impossible durability, which risks dragging the shadowy program that created him back into his life. Abandoning the women would break the promise he made to the man who sacrificed everything for him.

Quick answers

Why does Wade become the sisters' driver?: To fulfill a promise to Captain Whitmore, who died saving him.
What threat unites Wade and the sisters?: Vivian's fiancé Blake is poisoning their grandmother and hunting them.