The Promise

Sarah manages to link the two girls' disappearances and piles up evidence against Fouquet. She is troubled when her old high-school boyfriend slips back into her life, oblivious to the fact he's a suspect in Meyer's case.

Fouquet has all the trappings of a dangerous child predator. Sarah is sure she's found the man behind Meyer's and Vidal's disappearances. She starts seeing Tony again, unaware that he's been incriminated in her own investigation.

Tony is arrested, but denies having anything to do with the disappearances. Even though, Sarah is pulled off the case for being involved with the suspect, she secretly investigates the Meyer case, and discovers an important clue.

The DNA found on Meyer's boots leads to a surprising female suspect. Realizing the woman is also involved in Vidal's disappearance, Sarah races to find the little girl before she suffers the same fate as Charlotte, in the finale.