So This is Christmas: The Adrien English Mysteries 6 in Bloomington, MN

God Help You Merry Gentlemen...
Arriving home early after spending Christmas in jolly old England, sometime amateur sleuth Adrien English discovers alarming developments at Cloak and Dagger Books--and an old acquaintance seeking help in finding his missing boyfriend.
Fortunately, Adrien just happens to know a really good private eye...