Queen's Nightingale (Black ButlerxReader)

What happens when The Queen's Guard Dog and the Snake are assigned to help the Nightingale?

(YN ) Eleanor never had any interference in her mission until she failed to do her duty the Queen declared that she needs a little assistance from Ciel Phantomhive, the Queen's Guard Dog and Alois Trancy, the Queen's Spider.
(YN) Eleanor finds herself torn apart between the two young nobles.
Will she do something imprudent that might destroy her life?
Will they be able to capture the murderer or will they fail?