"Laid to Rest" is a mission in Sequence 12. Be sure that you have the Poison Darts as it will ensure success here.
Limit Regular kills: 15
Kill the HMS Jersey Captain
Escape the HMS Jersey without entering Open Conflict
Head straight on forward to the service that is going on. Connor is taken in a cutscene and shown to the person he is after: Charles Lee.
Counter the blow
Kill all the mercenaries
Head for the waypoint
Climb the HMS Jersey undetected
Eavesdrop on the captain
Escape the HMS Jersey
Lee's Last Stand