Radamel Falcao scored his 45th in European club competitions on Wednesday as he lead Monaco into the semi finals after they completed a double of Borussia Dortmund.
Monaco beat Dortmund 3-1 on the night and 6-3 on aggregate to complete the roster of teams in the final four.
The visitors came to the Stade Louis II eager to overturn a 3-2 deficit from the first leg at the Signal Iduna Park and trying to put last Tuesday's traumatic attack on the team bus behind them.
However, their preparations suffered another setback as police held their coach back at the hotel, seemingly 'without justification', forcing kickoff back by five minutes.
Once the action got underway, it took the hosts only three minutes to open the scoring as Benjamin Mendy's long-range effort was poorly parried by Roman Burki and the prolific Kylian Mbappe was on hand to slot home the rebound.
Falcao made it two for Monaco in the 17th minute as the host were already cruising at half time.
Dortmund attempted a fight back and they seemed to be on course when Marco Reus reduced the deficit three minutes into the second half.
Unfortunately, the German club could not follow up with another goal and when it was nine minutes left on the clock Monaco struck again; this time through Valere Germai scored minutes after coming in as a sub.