There are 4 books in the The Book of Lost Doors series. The newest book is Gingerbread Wolves which came out in 2015.

Catskinner's Book is a science fiction/urban fantasy novel set in a surreal world unlike any that you have seen before. James Ozryck has a monster in his head. All of his life the entity that he calls Catskinner has made him a fugitive, afraid to get too close to anyone,…
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2
Cannibal Hearts

Book cover of Cannibal Hearts
Cannibal Hearts is the sequel to Misha Burnett's first novel, Catskinner's Book. A year ago James Ozryck was a loner, forced to keep the world at bay by the alien entity he calls Catskinner who shares his body. Now he has found a community of others whose lives have been…

3
The Worms of Heaven

Book cover of The Worms of Heaven
The third volume in "The Book Of Lost Doors" series begins when the enigmatic Agony Delapour is kidnapped and James sets off to rescue her. The kidnapper, who calls herself "The Orchid" has an army of followers, both human and otherwise, and information that suggests a traitor within Agony's organization.…

4
Gingerbread Wolves

Book cover of Gingerbread Wolves
“Everyone dies. But not everyone can die killing a god.”Gingerbread Wolves, the fourth volume of The Book Of Lost Doors, pits Outsider modified humanity against the Outsiders themselves as Agony Delapour vows to make war against deep heaven. James is caught in the middle, between those he loves and the…