Nigel Ogilvie hurried up the stairs to the Reading Room on the first floor, and made his way, panting slightly, to the big windows overlooking the square. It was a dazzling spring morning, the sun glistening on new foliage bursting from the trees in the central garden, so that it seemed as if King William on his bronze horse was prancing through a brilliant green cloud. Nigel spotted the familiar figure sitting on a bench not far from the statue, her head bent over a book, and watched as she wiped her mouth with a paper napkin, then slowly gathered up the wrapper and drink bottle by her side. He reached into his pocket for his mobile phone and took a picture, capturing the moment as Marion got to her feet and the sun caught her, setting her red hair alight. She began to walk towards the library, tossing her rubbish into a bin. Her coat was unbuttoned, and he watched the swell of her thighs beneath her dress as she strode, head up. Lithe, he thought, that was the word. He felt a small quickening of his heartbeat and turned away, making his way across the Reading Room to where he’d left his book earlier. Settling himself in the red leather armchair, he opened the heavy volume on his knee and waited, eyes unfocused on the text.

He was finding it hard to concentrate these days, his research not going well. The idea for the project, Deadly Gardens, had been dreamed up by his boss over a boozy lunch, and Nigel was convinced that it wasn’t going to work. For the past week he’d been trying to make something of the gardens that Lucrezia Borgia would have known at Ferrara, Nepi, Spoleto and Foligno, but really, it was a waste of time-Lucrezia had had more pressing things on her mind than gardening. She too had red hair, if Veneziano’s portrait was to be believed, and Nigel imagined that she and Marion might have other things in common-a dangerous attraction, for one.