Shadow Pavilion

When his partner goes missing, Chen discovers a transcendental assassination plot
Detective Inspector Chen is getting used to visiting Heaven. It is a peaceful place, but the eerie calm and ever-present scent of peaches make him yearn for the chaos of Singapore Three. He has come to visit Mhara, the Emperor of Heaven, who ascended to the celestial throne after his father went mad and launched an ill-advised invasion of Hell. Order has been restored to the cosmos, and Mhara is characteristically serene, but trouble is lurking for this handsome young god.
Someone is trying to kill the Emperor of Heaven, and Chen does not have his demonic partner, Zhu Irzh, to fall back on. Zhu Irzh has vanished, Chen's wife is in danger, and a psychotic Bollywood star is on the warpath. It's another day in the office for the occult detective--a day that, if he doesn't restore order quickly, could be the universe's last.
The Shadow Pavilion is the fourth of the five Detective Inspector Chen Novels, which begin with Snake Agent and The Demon and the City.