Shadowlair is a novella of 30,000 words (roughly 100 pages), and is only available when you sign up for the TW Iain newsletter.
When Haven’s long-range sensors reported unfamiliar signals out on the rim, there was no immediate panic. It was probably nothing more than a glitch. But protocol demanded an investigation, so a crew was dispatched.
The crew never returned.
The rescue mission found their abandoned craft a few days later, but storm stopped them probing any further.
And so they never found evidence of the stowaway. They never followed the trail into the gully.
They never discovered if the crew lived or died. Or if something worse happened.