The Dark River by John Twelve Hawks (2007) Doubleday 

The Brethren have set events in motion and the Harlequin must continue to protect the Travelers.  The brothers are in two different camps hoping to learn enough about their father to find him.

Swallowing Darkness by Laurell K Hamilton (2008) Ballantine Books 

Merry Gentry is pregnant with twins fathered by her royal guard.  But conspiracies in both faerie courts threaten her guards, herself and her unborn children.

The Traveler by John Twelve Hawks (2005) Doubleday 

There are people who want to control the world by forcing it to follow orders.  There are Travelers who bring change to the world.  The Tabula see Travelers as dangerous to world order.  And there are Harlequins who protect Travelers.  This is a story of a Harlequin who is called to serve and protect a set of brothers who may be Travelers against the Tabula agents sent to kill them.

A Lick of Frost by Laurell K Hamilton (2007) Ballantine Books 

Merry Gentry is trying to avoid the courts of faerie.  Both are seeking to kill her so they can put their own sinister candidates on the throne.  Then one of the courts accuses her royal guards and is trying to get the mortal authorities to extradite them to his court.  How will Merry keep that from happening?

Return to Sender by Dick Cluster (1988) Dutton 

Alex Glauberman is a cancer patient who takes on a high-paying mission to deliver a package.  Then he has to race against time to retrieve it before it reaches its destination.

A Stroke of Midnight by Laurell K Hamilton (2005) Ballentine Books 

Merry Gentry prefers to solve cases as a private investigator.  But she is constrained by sitting on the throne of faerie and fears becoming the dark magic that she has to wield to rule.