After the shocking events of issue #4, The Eccentric has placed a bounty on Archer & Armstrong's heads, leading to all manner of mercenaries coming out of the woodwork. When Mary-Maria, Archer's adopted sister (and expert assassin with flexible morals) shows up asking for help with a rogue demon menacing her Sisters of Perpetual Darkness, can they even begin to trust her, or are these nuns flying straight to H-e-double-hockey-sticks-and taking A&A with them?!