Cleo Hollings has earned her nickname Wicked Witch of Murray Street working as the Deputy Mayor of New York City. If there is a problem, then she is the woman who will get it resolved. She takes her professional and familial obligations very seriously which leaves little time for herself. When Sean O'Sullivan seeks out her assistance, she thinks a bit of fun is in order. She has heard about his reputation, and she is more than willing to trade favors. Will she be satisfied with a few stolen moments here and there? Can she afford to let him fully into her life?

Sean O'Sullivan needs help getting the family bar reopened. As a lawyer, he is well acquainted with paperwork and the paper trail from the bar citations leads him straight to City Hall. He easily finds his way into Cleo Hollings' office knowing that she is the true power behind City Hall. He has no doubts that Cleo will quickly resolve the issue and things will be back to normal. However, he does not want to escape her clutches so quickly. She has some quality that appeals to him. Will she be the one to finally tame Sean O'Sullivan? Will he settle for whatever she will offer?

Kathleen O'Reilly has written a fun, sexy romance. The main characters are powerful in their respective careers and each is a force to be reckoned with. Cleo is used to people listening to her and obeying her orders. Sean is used to winning his cases in a court of law. Both are worthy adversaries, but they are on the same side until their hearts become involved, and then the gloves come off. I enjoyed the witty banter and the sexual tension escalating between them. Ms. O'Reilly even does a marvelous job of portraying the seriousness of Alzheimer's. NIGHTCAP provides fantastic sizzling romance, and brings a satisfying conclusion to the O'Sullivan series.