If They Knew: The latest crime thriller book you must read in 2018. Joanne Sefton

– in fact, no life at all before meeting Neil at the age of twenty. Occasionally, he would call her his girl who fell to earth. Helen had badgered him over it at times, mostly when she was in her teens, but as life unfurled, the mystery seemed minor in the scheme of things. It had become part of the scenery.

      ‘I know who you are,’ the notes said, and the words made Helen’s blood turn icy, because the truth was she didn’t. And she never had.

      She tried to imagine asking her dad about it now; her relationship with Neil had always been simpler. He was her dad; he loved her, worried about her and thought she was a superstar. She was his daughter; she loved him, allowed him to bore her with his gardening chat and bought him socks for Christmas. For as long as she could remember, they’d been able to talk easily about just about anything.

      But she hesitated, only now realising that the one thing they never really talked easily about was Barbara. Her mind was full of the image of his face, crumpling at the sight of his wife’s blue honeymoon dress. The notes would be devastating – doubly so if Barbara hadn’t told him about them herself, which Helen was convinced was the case. ‘Jennifer’ had threatened to tell Neil something – Helen had no idea what – but if she showed him the notes she might well blunder into the very threat that ‘Jennifer’ was holding like an axe to Barbara’s neck. So she was left with the first option she’d thought of. And the one Helen had always found most difficult – trying to talk to her mother.

      She folded the notes into their envelopes, tucking them deep in her pocket to return when she had the chance. Then she washed her face as quietly as she could, using cold water to try to subdue the redness. The tears had been close to the surface since that awful phone call with Darren, and her anger on reading the notes had quickly brought them back. When she finally looked human, she combed her hair through, listening to the hum of the house around her and the laughter and chatter of the children with their grandparents.

      On the surface, she thought, this looked like perfection. No fly on the wall, or neighbour peeping through the net curtains, would know the different ways in which every heart in this house was breaking.

       June 1963

       Katy

      She recognised the stern, mustachioed face of the policeman who came towards them, though she wouldn’t be able to name him. As Mr Robertson opened the door for Katy, the officer held out a pair of handcuffs, gaping open, the metal glinting in the sunshine.

      ‘I don’t think we’ll need those, thank you.’ Mr Robertson’s tone was firm, and the other man frowned.

      ‘Protocol—’ he began, but Mr Robertson cut him off.

      ‘I have custody of the prisoner. Miss Silver and I are content that nothing untoward will happen, and if it does, then we’ll be the ones to answer for it.’

      ‘For the sake of the family, though,’ the officer tried again, waving towards a large white estate car, painted with the letters ‘POLICE’. Katy supposed that Etta was inside.

      ‘Mrs Gardiner is here to try to find her child, not to see Katy Clery humiliated. You can put the handcuffs away.’

      Katy wasn’t so sure that she agreed with Mr Robertson on why Etta Gardiner wanted to be there, but the policeman finally did as he was asked. A few of his colleagues had made their way over during the discussion, and Mr Robertson exchanged pleasantries with the inspector in charge. The plan was that they would initially walk across the site onto the adjacent farmland, to the vicinity where it was believed that Katy must have accessed the site a year earlier, coming from the railway station. Katy turned and walked with them, keeping close to Miss Silver so as to not give the police any excuse to pull out the handcuffs again. None of the adults talked to her, although she was all they were talking about.

      A few seconds after they had passed the motorway patrol car, she heard its door open and the rustle of a passenger getting out. Risking a glance back, she saw she had been right. It was Etta, not in fur this time, but instead in a black, shapeless dress and jacket, a dark-dyed straw hat pressed low on her brow. Their eyes met, and for a moment Katy thought she saw sadness rather than anger. Then the woman turned deliberately to one side, away from the constable at her shoulder, and spat coolly onto the tarmac. The hatred, when she lifted her eyes back to Katy, was clear.

      Katy fought back the tears prickling behind her own eyes and continued to walk forward. Soon the police started to slow. They were nearing the edge of the site. The tarmac of the car park ended, and there was a thin strip of scrub before a wire fence. Someone had cut a gap. There was a neat roll of fencing wire stacked to one side – ready to fix it quickly so everything was shipshape for the grand opening, she supposed.

      There were nettles around the fence, and as they made their way into the field, the ground became soft and uneven. Katy, now used to the confines of Ashdown with its paved yard and endless linoleum corridors, felt herself stumble. The smells of the wet earth, of the green grass, buzzed in her mind.

      ‘Well,’ said the inspector, suddenly turning to face back towards the service station and the motorway beyond it. ‘Do you recognise it? Are you planning to tell us anything, or just to waste everyone’s time again?’

       July 2017

       Barbara

      She held the soap out under the shower water. The jets carried away the film of dust and the creamy white surface began to glisten. She turned it over in her hands, waiting for the hot steam to release that unmistakable floral scent. Tesco shower gel was sufficient most mornings, but today something more potent seemed called for. The bar of No. 5 had been eased out of its monogrammed box and pressed into service.

      I’m still me, she thought, as she worked the soap into the brown marks left on her dry ankles by her sandal straps, and then lathered up her shins in preparation for the razor. Saggier, more wrinkly and more blemished, yes. Bearing scars inflicted both by accident and design. But still, this body was recognisable as the one that had twirled in the blue dress up in Glasgow; still the same body that appeared, bikini-clad, in the Lanzarote beach photos from a few years later. Not to mention the same body seen smothered in sheets in the blotchy hospital shot from the day Helen was born. It hung on the bedroom wall even now, despite years of trying to talk Neil into taking it down.

      She’d decided a long time ago that age-related deterioration in eyesight was a small mercy; those stray hairs, liver spots and discoloured veins, which would have horrified her in her youth, were easier to ignore through the forgiving blur of myopia.

       I’m still me.

      Her limbs were firm and strong; she’d been careful not to run to fat, though it was true her back ached now when she bent like this to shave her legs. At least the hairs grew slower than they used to, even if they compensated with random migration – sprouting witchily in unexpected places. All in all, she looked and felt in good nick for sixty-nine. That had been old-woman territory in her own mother’s day, but not any more.

      Barbara remembered the paradox of the ship of Theseus – not that there’d been much in the way of the classics where she’d had her education, but she’d come across a Myths and Legends book in the library during her early days at the newspaper. It turned out that a couple of renewals brought a surprising amount of useful bullshit within her grasp. If every plank on a ship is replaced, one by one, until none of the original planks are left, is it still the same ship? Or the same axe, or broom, or human being?

      It was said that our constantly regenerating cells meant no part of our body was ever more than seven years old – or perhaps it was ten? What, then, made these the same feet that had run pell-mell on terraced streets in gaping shoes? What made these the same lips that joined, shaking, with Neil’s on their wedding day? What made these the hands that, trembling