I'll try and help you out although the info might not be in the order it happened.
At the beginning of the show, Veronica and her Dad find out that Meg's father is offering a $20K reward for the capture of Mayor Woody - whereabouts unknown. Veronica pretends to be Gia and calls the attorney to get a message to Woody. Keith has a phone trap and finds out where Woody is - a rich man's hunting camp in Nevada.
Meanwhile, Veronica is preparing for graduation. In the middle of the ceremony, idiot Sheriff Lamb comes in and arrests Weevil and takes him out in handcuffs before he can receive his diploma. Keith leaves at the end of the ceremony to go after Woody.
Veronica is still busy trying to figure out who the third boy was on the Sharks' Little League team. She runs into Beaver and Mac and she informs Veronica that Beaver got them a room for after the graduation party. Wallace's Mom tells Veronica that he has just taken off for Paris to go find Jackie and asks Veronica if she had any idea what he was up to.
Veronica finds Jackie and calls her. We then find out that Jackie is not in Paris but rather a Brooklyn, NY diner working with her Mom. She has a son whom her Mom has been watching while Jackie was in Neptune living the sweet life with her Dad. Veronica tells Jackie she got suspicious when Jackie seemed so experienced while working at the coffee shop with her. Veronica tells Jackie what Wallace is up to and tells her he has a four hour layover at JFK if she wants to stop him from travelling to Paris to find her.
Keith captures Woody and calls local law enforcement to arrange for Woody to return to Neptune and face the music. The local sheriff hires a pilot to fly Woody, a deputy and Keith back to Neptune in Woody's plane. Woody vehemently denies that he blew up the plane insisting he would never do any harm to children when Keith reminds him that he already has by molesting them.
We now see scenes from Logan's graduation party. Everyone is having a great time and Beaver leaves with Mac for their room. They are in bed and we then switch to a scene of Veronica entering one of Woody's fast food places. She is looking at team pictures to determine who the third boy is. She finds one that shows "not pictured - Cassidy Casablancas" AKA Beaver! Veronica suddenly realizes who blew up the bus and tries calling Mac to warn her with no success.
Veronica goes to the party to try to find Mac. She is stuck in the elevator with none other than the weasel Aaron Eckles. They have a very uncomfortable conversation where he admits to Veronica that he felt great when he hit Lily with the ashtray and killed her because he was finally able to shut her up. Veronica can't find Mac at the party and Dick tells her Beaver and Mac are in their room.
It seems that Beaver is having a little trouble completing the act, and Mac is trying to reassure him. Mac goes to take a shower while her phone starts buzzing. Veronica texts her that Beaver is a killer and warns her to get out. Unfortunately, Beaver is the one who sees the message. Meanwhile, Veronica receives a message she thinks is from Mac asking to meet on the roof of the hotel.
Veronica goes to the roof where she is confronted by a gun wielding Beaver. She then spells out everything that lead up to the bus being blown up. The two other molested boys told Beaver they were going to the police about Woody. Beaver couldn't let that happen because of his father and Dick - he knew his life would be ruined. Veronica also figures out that it was Beaver who gave her the STD - he raped her at the party where she was given the Roofie instead of walking away as he previously told her! He caught the STD from Woody! He also admits to putting the bomb in Woody's car and tells her that he put another one in Woody's plane, which he is about to blow up. She begs him not to because her Dad is on the plane. He allows her to call and say goodbye, but Keith doesn't answer. We then see a plane exploding in mid-air.
Aaron Eckles is feeling very pleased with himself as he just slept with Kendall Casablancas. She has left and he is enjoying a cigar while watching one of his old movies on TV when someone shoots and kills him! We can see that it's not a member of the regular cast. The hitman makes a phone call to Australia and announces, "It's done" to Duncan who is playing on the beach with his daughter!
Veronica is collapsed and crying on the roof as Beaver is about to shoot her. She forwards her text message about the roof to Logan who rushes up there to try and talk Beaver out of shooting Veronica. Beaver takes several shots at Logan while Veronica manages to tackle Beaver and get the gun. She is all ready to shoot him and Logan talks her out of it. Beaver has been edging toward the edge of the roof and jumps to his death.
Kendall is in her attorney's office where she finds she is a very wealthy woman because all of the assets of Beaver's real estate company are in her name - around $8 million.
Logan takes Veronica home where she is dreaming that everything is okay. She smells bacon cooking and thinks her Dad is making breakfast when it is actually Logan. They are hugging when suddenly the door opens and in walks Keith. It seems that Sheriff Lamb didn't want Keith getting off the plane and taking the credit for capturing Woody so he had to rent a car and drive home. Veronica and Keith are then getting ready to go to the airport for a week long trip to New York - Veronica's graduation present.
Wallace is in JFK looking around when Jackie walks up to him and tells him the truth about everything including the fact that her Mom is not a model but a one-night stand of Terrances that resulted in her birth.
Veronica is at the airport waiting for her Dad who had to pick something up from the office. Keith is about to leave whene Kendall walks in and says she wants to hire him. He explains that he'll be back in a week and she responds by opening up a briefcase full of cash and saying she needs him now. Veronica is left standing in the airport waiting for her Dad . . .
I think that's everything. If anyone else wants to add more, be my guest!
