Blackmailed by members of the Queen's Privy Council because of her husband's homosexuality, Lady Katherine, Countess Lyminster, must serve as a spy at Elizabeth I's court. When her husband is murdered outside a house of male prostitution, she joins forces with Christopher Marlowe, famed play maker, her husband's former lover, and frequent spy in his own right, to uncover the plotting and counterplotting that endangers not only her family's solvency, but the security of England.
Katherine battles Charity Bonner, a wealthy Puritan who had once been the late Earl's betrothed, amid a complex welter of greed, religious extremism, and personal animosity. In the process of untangling this knot, the Countess travels to the stews of London and war-torn Flushing before the murder can be solved and her own future made safe.
Well I'm always in favor of seeing Christopher Marlowe brought to life but even he would say you're going to need more bang for the buck here.
Reviving the family fortunes is not that compelling in a hook. Saving the monarchy, maybe, but really, we know how that ends, so also not a good choice. You're going to need higher stakes.
And making Charity the Puritan a more compelling villain, even one we might have some sympathy for, at least earaly on, is going to help a lot.
You're going to have to really dig up something fresh and new to hook me on this. This is not an unexplored trope in novels by anyone's measure.