The Arnos travel to Las Vegas when Danny is assigned to go to a fading, off-the-strip casino to protect Linson, the casino's owner and a former mobster who's been cooperating with the FBI. The casino is the perfect place for Danny to revive his lounge act, but when mobster Lon Colomby and his mother arrive for a ""vacation,"" playtime is quickly over. Colomby fully intends to buy Linson out-using whatever means necessary. Complicating matters further, another undercover agent, Ellen Lederer, is also at the casino working on the case, but her interest in Columby may be more than professional. Can she be trusted? The case even takes a personal turn, as Danny begins to suspect that Colomby may be the man behind the murders of his very first partner and his partner's family. Part one of two.