The Camel club witnessed two men putting down a dead body with a gun and suicide note.
So it is a murder pretended to be a suicide.
They didn't revealed themselves as they have no gun and the bad guys are armed.
So they tried to insert themselves into the investigation.
It is a slow start. Not liking it as much yet. Probably because not getting familiar with the characters yet.
And it is a longer book. Let's see what's going on.