Utilize your skills as a thief to OSRS gold find them. Follow them , but don't be too close. Colonel Grimmson might be able to spot you. Make sure you are at least 5 squares in front of them. Be on the lookout for them when they walk into Hreidmar's house. They will be told to meet at "the place" by a person. They will be transported there by the boatman. It will be necessary to eat and combat...