'The warrant to search Wilks' home finally came through' Frost announced triumphantly, striding into the office, 'I've contacted the wife, she's expecting us. You wanna come with me and check it out?' he asked, looking from Jane to Korsak.

Jane stood and stretched, 'I'll come, I've been staring at his bank records for two hours and I've gotten nowhere'.

After ten minutes of knocking at the Wilks' front door, the partners realized there was only one thing for it.

'Break it down' Jane said with a grimace, if there was nothing to be found here, they would be in serious trouble, she thought to herself, as the hinges splintered under Frost's powerful kick.

They separated as they tiptoed through the house, sweeping each immaculate room for anything suspicious.

'Jane' Frost called from the kitchen, his voice sounding strangely hollow, 'I think I know why Mrs Wilks didn't answer the door'.

Jane entered the kitchen to find a thoroughly nauseated detective, standing as far away from the late Mrs Wilks body as he could manage.

'Cyanide poisoning, same as her husband' Maura announced to the detectives that were gathered in the crime lab later that evening. 'And the only thing in her stomach was coffee, same as her husband'.

'And she hadn't left the house so the coffee has to be from there' Korsak said, glancing around the lab, 'have you tested that?'

'Suzie is doing it now' Maura answered, stripping off her latex gloves, 'but she won't have the results until the morning, we're understaffed'.

'So we have to go and do the notification while we wait' Jane sighed into her hands, 'Yesterday we had to tell the son his Dad was dead, and today his Mom'.

'We haven't checked to see if the kid has an alibi yet for his Mom's murder' Frost shrugged, 'He might have done it'.

'But he has an alibi for his father's' Jane pointed out, 'he wasn't even in the city'.

'I don't see any other suspects jumping out at us, do you?' Korsak muttered, 'I say we bring the kid in, do the notification here'.

Jane nodded slowly, 'Okay, you go pick him up'.

'I'm so sorry to tell you, that this morning your mother was also found dead' Jane said gently to the mousy looking boy across the table, 'we believe she was killed by the same poison as your father'.

The boy kept his eyes fixed on the table, showing no indication that he had even heard the detective.

'Bradley, where were you the day leading up to your father's death?' Korask asked the boy.

'At… At my dorm in Worcester' Bradley finally stammered, 'I have finals, so I went back on Sunday to study'.

'Were your parents having any problems that you knew of? Maybe with a neighbour or any money troubles?' Jane continued gently. Bradley shook his head sharply.

'Everyone loved my Mom' he said quietly, still looking down at the table, 'she went to church, volunteered at soup kitchens, donated to charity…' he trailed off.

Korsak and Jane exchanged a significant look, 'What about your father?'.

Bradley's demeanor visibly changed, his eyebrows knitting together as his shoulders drooped. 'He didn't bother with that sort of thing. Most people preferred my Mom'.

'Including you?' Korsak prompted.

Bradley nodded silently.

'We're sorry for your loss Mr Wilks, please don't leave town, we will be in touch'.

'The cyanide was in the bag of coffee' Maura declared as she entered in the detective's office several hours later, 'The coffee was completely saturated with it, a single pot of coffee could have killed Mr Wilks 8.4 times over'.

'So he drank the coffee at home, then ten minutes later dropped dead outside his work' Jane said slowly, standing to look at the crime scene photos, not noticing Maura trying to catch her eye.

'Then his mourning wife makes a cup of coffee with the same beans the next day and it kills her too' Korsak summarized, 'the question is, which of them was the actual target?'

Jane's eyes scanned the pictures in front of her, before Maura cleared her throat from the back of the room.

'If you don't need anything else tonight, I'm going to head home' she said, turning to leave 'Jane?'.

'Wha-? Oh no I'm going to stay for a bit longer' Jane replied, turning to face her Maura, 'I've got a hunch I want to look at'.

'Okay' Maura said quietly. But Jane was focused on work, and didn't even notice the hurt in her girlfriend's eyes as she slipped out of the room.

*SMACK*

Jane jerked awake as the heavy file was dropped in front of her face.

'Good morning' Frost said with a raised eyebrow, 'I see your hunch is working out well'

Jane made a rude gesture and yawned, rubbing her face to try and get rid of the crease marks caused by sleeping on a pile of paper.

'What's this?' she said groggily, waving a hand over the offending file that had woken her.

'Bank statements. Up until six months ago, Dan Wilks was paying for his son's tuition; then he stopped.'

'Ran out of money?' Jane asked, stretching.

Frost shook his head, 'they had plenty, and we found voicemails from the son begging his father not to cut him off'

Jane cocked an eyebrow, 'that sounds like motive'.