Stuck on level 4 Epic Arc for Caldari

PvE Gameplay Center Missions
4

Hopefully you completed mission 14 with Agent Sinas Egassuo and then actually accepted one of two different choices offered for mission 15.

Nugoehuvi path
Mission 15 - A Difference of Opinion (Story Arc Branch)
EVE-Survival: Penumbra, Level 4 Epic Arc

The story arc branches according to your choice :

If you didn’t do ‘An Honorable Betrayal’ from the first branch, your choices will be :

  • Home In Peace
  • Learning by Doing

Since you mentioned Agent Katsen Isha, I suspect you wanted to do mission 16 - Learning By Doing - report to Agent Katsen Isha. You probably just forgot to accept the mission offer from Agent Sinas Egassuo before traveling.