General Questions

1. You need to establish "method, motive, and opportunity": That means you need either physical evidence or reliable testimony that proves how the crime was committed, why the suspect did it, and when the suspect had the opportunity to do it.
2. (WARNING: The following hints tell what the method was and how to prove it.)
3. You can prove the actual murder method either by proving that a gun was in the clock and was set off by the butler's button, or by getting Monica or Phong to spill the beans.
4. You can prove that a gun was in the clock either by analyzing the gunpowder on the keyhole or by finding the gun itself in Monica's possession.
5. You can prove that the button set off the gun by pushing it between the time Linder is shot and the time Monica gets home.
6. Monica will spill the beans if you accuse her after seeing her remove the gun from the clock, or if you ask her about the gunpowder, or the grandfather clock, or the butler's button, after you have proven the button connection.