Amelia Pond saw the way Mark kept glancing up at the kitchen window where his wife stood peeking through the blinds. "Mark, who did you meet on Briar Cliff?" D.I. Pond grabbed his attention. "Is there any particular reason you wouldn't want to tell me the name of the person you met?"

"I forget but it'll come back to me." Mark chuckled nervously.

"Not remembering who you met is a rather large gap in your recollection." Pond wasn't buying it for a second.

"Sorry, I haven't been sleeping since all this. My head's not on straight." Mark continued to deflect so the D.I. decided to drop the questions for now. But Mark was to meet them back at the station the next day to fill in the gaps.

The next morning as the sun struggled to make it's way over the horizon, the beach hut at the top of Briar Cliff was quickly sifted through for evidence. Some prints were found matching Danny's and Mark's.

"I really don't think Mark is capable of this" D.S. Oswald sighed. "There's plenty of reasons why his prints could have been in that hut."

"You need to wake up and look at the evidence in front of you and stop acting like you're his bloody solicitor!" Pond had clearly angered Oswald but she didn't stop there. "Your son and Danny were close so we'll need to interview him alongside an appropriate adult. Not you, of course." With that Pond walked away leaving Clara to quietly fume with repressed frustration at the edge of the cliff.

After a long morning of collecting information from the crime scene, Clara Oswald came home to her husband and fell into his arms. "I'm just here for lunch, I have to get back." She whispered.

"How's the new boss?" Joe enveloped his wife in a hug. Clara simply started to cry as her anger and frustration finally got released. Joe guided her to a chair and had her sit on his lap as he cradled her. He kissed her forehead, "So it's that bad, is it?" He chuckled a bit. "It's going to be ok" he whispered. Clara gathered enough strength to drag herself back to the station to question her neighbor on the murder of his son. She knew deep down it couldn't be him but in the interrogation, he wasn't helping to prove his innocence.

"Sorry about yesterday, I was hazy when you asked me all those questions." He forced a tightlipped smile.

"No, you were just trying to lie." Pond was in no mood to play games. "You said yesterday you were out with a mate on Thursday night but you couldn't remember his name, now you do?"

"It was Nige, I work with him." Mark was too quick to reply.

"You couldn't remember the name of a man you work with everyday?" D.I. Amelia Pond's biting sarcasm was chilling the room.

"The shock is doing funny things, I suppose." Mark shrugged with a smug look on his face.

Clara's face grew worried. He was obviously lying, he was hiding something. She didn't want to believe it but she couldn't keep denying the facts in front of her.

"Have you been here?" Pond threw a picture of the hut on Briar Cliff on the table.

Mark shook his head yes. "I was there 2 weeks ago to fix a burst pipe."

"We'll be confirming that with the owners of the hut and with Nige." Clara spoke softly with a smile on her face. Still feeling sympathetic towards him even after the obvious lies and the terrifying possibility that he had a hand in his son's death.

Pond and Oswald left the station to speak with Nigel about their supposed night out. "He created an alibi overnight." Pond scoffed. "How convenient."

Pond spoke with Nigel while Oswald spoke with Nigel's mother. Nigel knew Mark was being questioned and had been coached by Mark to say the right things. Mark didn't think to coach Nige's mother. She told them the truth, Nige had been in all night watching TV with her. They confronted Mark back at the station where he'd been waiting for some time.

"Your friend isn't a very good liar so please stop insulting my intelligence." Pond leaned in as she spoke. "Your son has been murdered so I am honestly at a loss as to why you would intentionally mislead us." Pond was obviously angry but not because Mark had tried to pull the wool over their eyes. She was seeking justice, she wanted to do right by Danny no matter the cost and his own father was in the way of that. It infuriated her to no end. "Until you tell us where you really were that night we cannot rule you out."

Mark finally confessed the truth, he had been cheating on his wife the night of the incident with a Ms. Becca Fisher. Suddenly letting it all go, he broke down into tears. "I didn't want to tell you. I'm so ashamed. This is a punishment, a punishment for what I've done." Clara put her arms around Mark in an attempt to console him. Pond, still stone cold, told Mark he was free to go. "Just please don't tell Beth, please." Mark pleaded. They figured it best not to, Beth had been through enough.

Clara had trouble sleeping that night. She tossed and turned while her husband slept soundly beside her. She walked to Tom's room, then to baby Fred's room. She looked in on them and nearly cried. She couldn't imagine the pain of losing them, she didn't want to even try. It was then that her mobile rang, Beth left a message to ask if they could meet, now. They met in the small, open field between their two houses and the church at the top of the hill. They held each other in a tight hug and sat on the grass to talk. It was the usual 'how are you feeling?' chit chat before Beth just couldn't take it anymore.

"Clara, is Mark a suspect?"

"Beth, it's 4 in the morning."

"I have to know."

"It's not that simple."

"Yes it is!" Beth raised her voice but quickly regained her composure. "Do you think he killed Danny or not?"

"There were just some gaps in his movements that we weren't able to fill." Clara tried to explain.

"I know about Becca Fisher." Beth confessed. She'd been unable to sleep and saw her husband sneaking out of the house to meet her. She saw them kiss and heard them talking. She knew he was with Becca on Thursday. "He doesn't know I saw him."

"Beth, you have to talk to him and tell him you know. I'm so sorry." Clara embraced her friend as she tried to hold back tears. She looked up at the church in the distance at the top of the hill. There was a light coming from the open door of the chapel and a silhouette of a tall, thin man under the archway. "Is that Paul?" Clara asked aloud, making Beth turn up towards the church to look. Slowly he turned and closed the door.

Clara wondered if he could see the two of them holding each other in the field from where he stood. Was he simply standing at the doorway or was he purposely watching them? And if so, how often did the reverend stand and watch them from afar in the middle of the night? Everything and everyone around her grew more and more suspicious by the moment. The world was closing in around Clara and she couldn't stand it.