Numbers Never Lie

A shocking secret brings danger to Jack Sinclair and his sister Maggie. As kids, they were the fearless threesome. As adults, Jack's an accountant; Drew, a lawyer; Maggie, a teacher and camping troop leader. Upon returning from a weekend camping trip, Maggie receives horrifying news. She refuses to believe her brother Jack's fatal car crash was an accident. If the police won't investigate, she'll do it herself.
Convincing Drew Campbell to help is her only recourse. Drew Campbell was too busy to return his best friend's phone call. Too busy to attend a camping meeting important to his teen daughter. Too busy to stay in touch with Jack. Logic and reason indicate Jack's accident was just that--an accident caused by fatigue and fog. Prodded by guilt, he'll help Maggie even if he thinks she's wrong. A break-in at Jack's condo convinces Maggie she's right.
Then her home is searched. What did Jack do that puts Maggie in danger?