Spencer worries about a criminology paper she wrote at Georgetown that detailed a murder remarkably similar to Charlotte's. She realizes she had previously shared these specific details with Ezra.
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"Pretty Little Liars" Charlotte's Web (TV Episode 2016) - IMDb
This episode is a critical early entry in the "5 Years Forward" arc, dealing with the fallout of Charlotte DiLaurentis's murder.
Hanna finds security footage of Aria leaving and returning to the hotel. To protect her friend, Hanna deletes the footage.
The Liars remain in Rosewood after Charlotte is found dead. Suspicions quickly turn toward Aria when it's revealed she left the hotel on the night of the murder and didn't return until after the estimated time of death (around 4:00 AM).
