Five for Silver - Louise Collins

He may be weeks from death, but Vincent still pulls an unwilling Chad into his game. If he agrees to meet with Vincent, he will cooperate in the search for the remains of Harriet Hastings, his missing victim.
Chad is skeptical from the beginning, and believes Vincent is setting him up to fail with the eyes of the country watching.
But Chad's not alone in Vincent's game. He has recruited two other players, Lucinda Hastings, Harriet's sister, and retired Detective Inspector James Poole who Chad learns had a relationship with the missing girl.
The clock is ticking on Vincent's time, and he tells Chad a secret.
He's holding on to four words.
Four words he's saving until the end.
Four words that will bring about Chad's downfall.