TV show about a missing girl

I’m not sure, maybe it’s actually a movie or just an episode of some TV-series.
A guy meets a family with a missing little daughter. He’s told that this girl was kidnapped from her room via a window. But he notices that a flowerbox beneath the window is tilted. He asks about it and learns that it’s like this for a long time.
He figures out that it’s due to the fact that someone was sneaking out through this window several times. The older daughter confesses that she used to sneak out this way to parties. And one night her sister followed her to a party. The younger sister was socializing at the party and some guys offered her alcohol, and only then the older sister noticed her.
Cant remember what happened after that but the younger sister wasn’t seen since that night. In the end when it was discovered who murdered the girl, police chases the suspect through a garden and we see flashbacks how he chased the victim there.

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