February 1942 Setting: Allied convoy HX-25, with 37 merchant and troop ships, enters the "Black Pit," a Mid-Atlantic gap out of range of protective air cover.Escort Ships: The convoy is escorted by the USS Keeling (Greyhound), HMS James, ORP Viktor, and HMCS Dodge.Commander: Commander Ernest Krause of the USS Keeling is in his first wartime command despite his extensive naval education.First Engagement: Greyhound sinks a U-boat with depth charges after intercepting a German transmission.Subsequent Attacks: Another U-boat, bearing a grey wolf emblem, attacks and sinks a Greek merchant ship, but Greyhound evades its torpedo.Wolfpack: A wolfpack of U-boats stays out of range, waiting for nightfall.Tanker Attack: The 'grey wolf' U-boat torpedoes an oil tanker and escapes using a pillenwerfer, leading to the loss of another supply ship.Radio Taunts: A U-boat crew member taunts the convoy over the radio, and the wolfpack sinks three more merchant ships.Limited Depth Charges: Greyhound has only six depth charges left; it and Dicky sink one U-boat using combined attacks and surface broadsides.Damage and Losses: Greyhound is hit on its port side, killing mess attendant George Cleveland and two sailors. Eagle is sunk, and Krause allows its crew to abandon ship.Radio Silence Broken: Krause breaks radio silence to send a distress call, receiving a message indicating reinforcements will arrive at "point X-ray."Final Battles: Greyhound battles two U-boats, sinking the "Grey Wolf" with a broadside and marking the location for a British Catalina to sink the second U-boat.Relief and Victory: HMS Diamond arrives, relieving Greyhound and the other destroyers. Krause is congratulated for the four U-boat kills, and the convoy ships' passengers and crew cheer the Greyhound's crew.Conclusion: Krause sets a new course and finally sleeps in his cabin.