Black eyed susans

Left with three other girls in a grave shrouded by black-eyed Susans, Tessa alone survived, her testimony helping to put killer behind bars.
Now sixteen years later, he is about to be executed. But Tessa feels no relief.
Because someone is planting black-eyed Susans outside her window. Someone is sending her daughter sinister messages. And there's a lawyer telling her the man about to be put to death is innocent.
Which can mean only one thing: the wrong man has been sentenced, the real killer is still out there and Tessa might not be the last Black-Eyed Susan..