A Timely Intervention is a side quest in Dragon Age: Inquisition.
There are reports of red lyrium and potential red templar activity in the hills of Emprise du Lion. A local baron has petitioned the Inquisition for aid.
Obtained upon reaching Skyhold at the end of the main quest In Your Heart Shall Burn. It serves as an introduction to a new area to explore: Emprise du Lion.
Complete the war table operation Liberate Emprise du Lion which costs 20 Power to complete the quest and unlock the new area.