The Musketeers are sent to retrieve the Comte de Rochefort, the Cardinal’s man in Madrid who has escaped from a Spanish Prison. Rochefort brings news that the chief author of France’s military strategy against Spain, General De Foix, has been captured.

The Musketeers must join forces with Rochefort to rescue De Foix before this critical information falls into the wrong hands, but can Rochefort be trusted, and will the Musketeers succeed against the traps laid for them?