The last case of Chesterton the fantastic detective

Chesterton is a space detective. His job is to solve crimes all over the Galaxy. One day he receives a message that says that his ex-wife was murdered on a desert planet Helios-2. Upon arrival at the crime scene he finds out that she is still alive and the murder will take place only the next day. So now our detective has 24 hours to unriddle a temporal paradox, sort out his complicated relationship with his ex-wife and solve the murder which hasn't even happened yet.