If you enjoyed The Hunt for Red October you'll like Typhoon by Mark Joseph. It's the late nineties and a few naval officers, fearing the implosion of the Soviet Union and loss of Soviet satellites, have hatched a plan to force a military coup by faking a rebellion and threatening to launch an atomic missile at the capitol of Georgia. Admiral Zenko, in charge of the Soviet Typhoon class submarine base at Gremikha is determined to thwart the rebellion. A Los Angeles class American sub gets caught in the middle and a cat-and-mouse game results. A very entertaining read.