KNUCKLE DOWN is the third book in the Carter Matheson series.
When Mayor Lukas Burton's only daughter vanishes in broad daylight in Central Park, the city's leader will stop at nothing to bring her home safely. After Burton pays a ransom worthy of settling a small country's debt, she is returned. However, the kidnappers raise the stakes, asking for a second ransom that could bankrupt the Mayor, ruining his hopes of becoming the next President of the United States. The Mayor and his wife have been duped, because when young Abigail is returned, she's returned with enough explosives to destroy her family's Upper Eastside neighborhood.