Silver Girl by Elin Hilderbrand

What would you do if your very rich husband was arrested and charged with bilking all sorts of investors of their life savings in the amount of $14 billion dollars and you had no idea what he was doing?  Meredith Martin Delinn's husband ran a Ponzi scheme and took money from friends, family and complete strangers to finance his scheme.  Unsuspecting Meredith escapes to Cape Cod and her friend Connie's home.  Even though Meredith has no knowledge of what her husband has been doing, the police think she does and offer to let her off the hook, if she can help them recover the money.  Connie helps Meredith and in return, her house gets spray painted with "Crook", her tires are slashed and the seal who shows up daily is killed and left on the front porch.  Meredith must seach through her memories and knowledge of her husband's activities to figure out just where the money is hidden or she also faces going to jail.  By putting the many clues that her husband has left behind, Meredith is able to figure out where the money is and make sure that most of the investors get part of their money back.