Revenant by Kat Richardson

 With this, the ninth in the Greywalker series, we suddenly find ourselves a long way afield with Harper Blaine when Quinton's father, James Purliss, turns up in the middle of a plot to gain supernatural power in Portugal. Harper calls upon the vampire, Carlos, for help in getting her out of the country without anyone who might be watching noticing that she's gone, and he has her shipped in a coffin to his family's home in Lisbon, in the heart of the Alfama district.

My surmise is that Richardson has recently enjoyed a trip to Portugal (it turns out in the afterwords that she planned it but had to cancel), and decided to make use of her research in this novel. My wife and I visited Portugal a couple of years ago, and so it's proven vastly entertaining as I read this novel to find myself recognizing and visualizing the places Harper and Quinton go, such as when they get on the train to Cascais, where we have family, and spent a great deal of our time, or talk about the castle of St. George, a lovely place to visit and picnic at the crown of a hill in Lisboa, or she mentions in passing the pilgrims crawling on their knees to the shrine in Fatima.

When Harper arrives, she finds out that Purliss has kidnapped his own granddaughter, Soraia, who has budding supernatural talents, and has given her to his allies, the bone mages, who are building a spell which will have apocalyptic results in Portugal, giving them vast power. Quinton, Harper, and Carlos must rescue the girl from the mages, and find a way to thwart their plans. When Carlos is nearly destroyed by the apprentice of an old enemy, one of the mages, Harper's desperate sacrifice to save his life leaves the two of them changed, perhaps in ways which will affect the path of the plot arc eventually.

A marvelous (hopefully temporary) finale to the Grewalker series.