One of the PC Navigator's many rituals before entering warp travel is to get a card our of his Emperor's Tarot deck and use it as guidance during that travel.
The player has a normal tarot, and uses it during our game sessions... In this game, it happened he took out the Hermit and took for a sign he should be alone for this travel.
He then decided to do it all by himself (3 days travel), dismissed his 2 apprentices and locked himself alone in the Nav's chambers...
On the following day during an usual stop in real space, the supply vaults were found to be sabotaged with ork spores... When the issue was investigated, the last person to visit the supply vaults was one of the Nav's assistants. Security the proceeded to that assistant's quarters to arrest him and all they found was his body - clearly dead for days.
Madness and paranoia followed during the next week with redundant guard postings, escorts for all people in the officers deck/navigator spire, tech priests scanning people's faces for cybernetic implants.
Background:
Another Dynasty had a temple assassin embedded within the player's ship with a mission to delay the voyage as much as possible, that assassin planned to kill all Navigators and have the ship wait for someone to respond to the salvation beacon (not suicidal as they were in the Drusus Marches en-route to Port Wander).
Once he failed to kill the Navigator Primaris using the Secundus' face, he then proceeded to sabotage the supply vaults, after which he killed a pilot and fled using an Arvus Lighter in the next port they docked to for resupply (Port Wander).
Using the tarot, the Navigator PC effectively saved himself without burning a fate point (as I had planned) neither having to roll perception to notice a small drop of dry blood on his Secundus' collar. While also saving the ship from perils of an unplanned emergency drop into real space.
Edited by Sebastian Yorke