It would take forever to type it all.
Really short version
Jessie wants to get even (kill) the dealers responsible for killing his friend Combo(?), who was shot by the 11 year old brother of the girl Jessie is now sleeping with. Who he picked up at an NA meeting but that was to sell her meth until he found out she had a son, then he just wants sex. (Ya with me so far)
But the two dealers are employees of Gustavo Fring (Mr. Big) so Jessie, Walt, Gus and the dealers have a meeting to "make the peace" it does not go well.
The 11 year old is shot and killed (by the dealers ?. to keep him quiet ? ) Jessie goes nuts starts using meth again and Walt goes totally fucking Rambo.
Oh. yeah. Hank gets a hand-job from his wife as part of a bet to get him out of the hospital by proving he has sensation below the waist.
Skyler is going full tilt to get into the money laundering.
Try to watch it in re-runs it is the BEST show on television at the moment.