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Did something in the journal make Gwen find something of high value in the house?
( Pretty clueless, since the case seems to be solved by maybe 80%)

Did the murderer enter the house through the front door?
Was the door the murderer came in through wide open ?
Was the door the murderer came in through simply just unlocked?
Does the phone Gwen made the phonecall with have a certain unique feature?

EDIT:Does the house contain any doors at all ?
Can anybody access the house without having a key?
Were there more persons in the house? (Except Gwen and probably her killer) ?
Did the killer murder Gwen in her bedroom, I mean was he in the room ?
EDIT:Is the type of house important?
Did the murderer come into the house through a window?
Did the murderer take  money and/or jewelery from Gwen's body?

Did she let her murderer into the house?
If someone else had made the phonecall, would this someone have been killed instead of Gwen?
Did the phonecall come from a landline, i.e. not a mobile phone?
Does the person she called know the murderer?
Did Gwen know her murderer?

Did Gwen call the police, i.e. one of her relatives is in the police?
Did the journal contain information about a crime someone else had committed?
Did the killer also read the journal?
Was the killer mentioned in the journal?

Did Gwen find a phone number in the journal?
EDIT: Would she still be alive if she would have fallen asleeep in another room ?

Still can't believe that JackPutter solved the previous one in two attempts......
Thanks Mandle for the new case !

Is the father's wife still alive?
Is the father's wife her mother?
Does Gwen have brother(s) and/or sister(s)?
Did she find out that her father committed a crime?

Something that hasn't been asked before:
Is Barney's and Greta's home a house?
Is Barney's and Greta's home an apartment?
Is it a boat/ship?

I was sure Mandle had it.

EDIT:
Did the victim get strangled by hand, i.e. manually?
When Barney killed the other victim (which should be clear), was he already
so badly injured that he knew he would die?

EDIT:
Did Barney die BEFORE the other victim died?
Was Barney strangled?
Was one of the deaths caused by poison?
Was one of the deaths caused by a gunshot?
Was one of the deaths caused by gas?

[Did Barney kill the other victim deliberately?]

Mandle's solution seems quite close to me , except that none of the victims got stabbed.

EDIT: Was the second victim's death rather accidental than intended by Barney? Obsolete,
because :Did Barney kill the other victim deliberately?
EDIT EDIT:
Were the two victims related to each other?
Did they look like each other ?

Did Barney and the second victim die in a duel ?

Did Greta announce to leave Barney?
Was Greta at home when the two victims died?
Was the second victim's death caused by the first person's death ?(Regardless of who died first)
EDIT: Was Barney's plan to kill Greta instead of the other victim?

Did Barney and the second victim die the same way?
Does Greta benefit from their deaths?
Were Barney and Greta a couple?
Is there a fourth person involved?

Did Greta write the note?
Did Barney write the note?
Is the second victim female?
Is jealousy involved?

Are Barney and Greta still alive?
Are the dead bodies human?
Did either Barney or Greta write the note?

Has Harland's story been published in a book IRL, e.g. such as Robinson Crusoe ?

Was the disaster a volcanic eruption ?
Is Harland a celebrity ?

Was Harland on a (voluntary) diet?
Is Harland's religious confession of importance ?
Are very low temperatures involved in the disaster?
Was Harland a soldier at that time?

[YESWas there a natural disaster outside?]

YES
Was there a natural disaster outside?

Did the natural disaster also affect the dungeon ?
Was the natural disaster a flood?
Was the natural disaster a fire?
Was the natural disaster an earthquake?
Did the natural disaster open the dungeon for Harland to get out?