Editing Unwritten: System Reference Document/Discovery and Investigation (section)

=====Advantages in Questioning=====

The characters involved can use advantage rolls to butter up, outwit, or intimidate others and use invocations to get people to talk. Character aspects on all sides of the interaction are ripe for invocation. Compels are also appropriate, more so in these cases than in other types of investigation.

Previous clues can be used as leverage in trying to get someone to talk. You can use an Advantage action to bring up the clue successfully and use fate points and free invokes to press your advantage. GMs, roll with the invocations and be creative on fumbles and costs.