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Horatio is transported back to Miami to help the team find Calleigh, who's been kidnapped and forced to cover up a murder. While at the scene of the kidnapping, they notice that an ambush took place, involving Calleigh fainting from chloroform. Later on, one of the kidnappers turns himself in to the CSI's and tells them the location of Calleigh... but to arrest the remaining kidnapper without Calleigh becoming a victim, they cook up a poker plan, hoping that the kidnapper will "fold" after "all in".
Title: All In
All In is a poker term referring to when a player wishes to continue playing, but cannot continue betting higher due to lack of funds. The player indicates "all in", and any additional non-matching funds put into the pot are placed into a side pot available only to (and eventually won by) the other players who were not "all-in"... It is possible to have multiple players go into the "all in" state, splitting the full, final pot among several different people.