When young would-be-musketeer, Guillaume Jaucourt, falls dead from poison, his master Porthos finds himself ensnared in a deadly web of secrets. As the apprentice's carefully constructed identity unravels, revealing deception upon deception, the trail leads uncomfortably close to Porthos's own past and family.
The swashbuckling sleuths-Porthos, Athos, Aramis, and D'Artagnan-must navigate the dangerous streets of 1625 Paris while evading the Cardinal's guards. With each revelation comes a new suspect and a deeper mystery: Who was Guillaume Jaucourt really? What secrets died with him? And who stood to gain from his demise?
As blackmail plots surface and old wounds reopen, our heroes race against time to uncover the truth, their legendary motto-"One for all and all for one"-tested as never before in this gripping tale of murder, loyalty, and redemption.