Trust Me

TWO STRANGERS. A CHILD. AND A SPLIT SECOND CHOICE THAT WILL CHANGE EVERYTHING.
The chance encounter
Ellen was just trying to help a stranger. Giving a few minutes respite to a flustered young mother sitting opposite her on the train. A few minutes holding her baby while the woman makes an urgent call.
Five minutes pass.
Ten.
The twist
As the train pulls into a station, Ellen is stunned to see the woman step off the train and rush away down the platform, leaving her baby behind.
Then she discovers a note in the baby's bag, three desperate lines scrawled hastily on a piece of paper:
Please protect Mia
Don't trust the police
Don't trust anyone