Regular readers of Charles Stross's Laundry Files might have noticed
Bob Howard's absence from the events of The Nightmare Stacks, and his
subsequent return from Tokyo at the start of The Delirium Brief.
Escape from Yokai Land explains what he was doing there.
Bob's been assigned to work with the Miyamoto Group, checking the wards
that lock down Japan's warded sites--a task previously handled by his
predecessor Dr. Angleton, the Eater of Souls. This mostly involves
policing yokai: traditional magical beings, increasingly grown more
annoying and energetic.
But then Bob's simple trip turns into a deadly confrontation with the
ultimate yokai. It's massively powerful. It's pink. And it says "Hello."