15. A Hot Piece of 'A'

The girl's head back into the greenhouse to look for the box and decide what to do next. Spencer suggests calling Caleb to help them recover information from the phone. While Caleb downloads the information on the computer from the phone, the owner shuts the phone down. Caleb works on decrypting the files on his laptop at school, which concerns Hanna. Spencer approaches Emily, hoping to enlist her help in snooping around Jason's house. Emily starts community service at the crisis hotline that afternoon, Aria is on lockdown and Hanna is unhappy with Spencer for dragging Caleb into their "A" investigation.

Emily suggests Spencer let Hanna use her lake house with Caleb. At Hanna's house, Hanna tries to study while Lucas seems distracted. She gets a text from Spencer offering her the lake house. She gets the brilliant idea to use it to throw Caleb a surprise birthday party and enlists Lucas' help in planning it. Emily attends her first training session at the crisis hotline center. While reading a training transcript, Emily realizes the caller seems likely to be "A's" helper. Emily shows Spencer and Aria the transcript she swiped from the crisis center.

At the crisis center, Emily's supervisor tells her to listen in on the call that just came in because it is the transcript caller calling back. Spencer and Emily listen together and recognize the caller's voice as Lucas'. Spencer and Emily learn from Mona that Hanna took the rowboat out with Lucas to set up the fireworks across the lake. Halfway across the lake, Lucas stops rowing. Hanna flips, pushes him overboard, and takes the oars but later falls overboard. Emily to go inside and call the police as Hanna swims to the shore. ' A' ending: 'A' fishes up Lucas' shoes from the lake.