Pinatas
Box pinata with a spy picture or enlarged spy ID card taped to the front 

Invitations
Find a graphic of a spy silhouette and use that for the front of the invitation. Then write: Top secret rendezvous for spy training. Come in an undercover disguise. Surveillance has revealed the following classified information: include date, time and place for the party. 

Cakes
Magnifying glass 

Decorations
Silhouettes of the guest of honor in spy pose with gun

Silhouettes of oversized binoculars, magnifying glasses and smoking guns cut from poster board 

Costumes/Dress up
Fake glasses with fake noses

Secret Agent ID cards

Finger Prints with pencil graphite and tape 

Games and Activities
Who Stole the Party Cake? (ages 3-16)
This is a great finishing game for your spy party. Tell the guests you made a cake and left it right here! (You choose where “here” is.) Of course, now the cake is missing. Have your sleuths find the cake. Make obvious clues like a printout of a footprint and a large piece of torn fabric. They can follow a trail of spilled candies, cake sprinkles, or even glitter. For youngest spy guests you may even want to put a large tag reading “Clue #1” for each clue. Have your guests find the cake so they can enjoy eating it.

Clue or Clue Jr. (ages 5-16)
Get the classic Clue game, or Clue Jr. and play a few rounds.

Disguise Dress Relay (ages 5-16)
Divide your guests into teams. For each team supply the same, or at least very similar, items to dress in disguise. You can use a trench coat, fake glasses, fake moustache, wig, and a hat. Have the teams send one member at a time to put on the disguise over their clothes then take it off and have the next member of the team dress in disguise. The first team to have each member dress in the disguise wins this spy party game.

20 Questions (ages 6-16)
It’s important to know how to ask questions to gain the information you need as succinctly as possible. Play the 20 Questions spy party game to master this skill. Give each guest a secret code name from a well known movie or cartoon character. Then have the guests pair off and take turns asking each other no more than 20 questions to determine each other’s secret code name. Rule is that each question must require only a yes or no answer.

Whodunit Mystery (ages 8-16)
This is a simple game, really. One person is the inspector. The inspector hands out small pieces of paper to everyone—all are blank except one that has an X. Not even the inspector should know who gets the X. Then the guests visit and mingle. The “killer” scratches the one guest’s hand when shaking it and that guest, after shaking a few more hands, should “die.” Then the inspector gets to question all the guests to try to determine whodunit. This is a simple but fun spy party game.

Sleuthing for Details (ages 8-16)
Spies need to know how to be observant. What details can your guests notice? Put 5-20 items on a tray, allow your guests to see the items for 1-2 minutes. Then hide the tray, or cover it, and ask your guests to write on a paper all the items they saw. The guest with the most wins.

Crafts
Hidden Message (ages 3-12)
Write secret messages with white crayons on white paper. Then lightly rub with a colored marker to reveal the message.

Puzzle It (ages 3-16)
Write a secret message on the back of a puzzle. Put the puzzle together on a board and quickly turn it over, so that it’s upside down, but mostly stays together. Then carefully write your message on the back. Take the puzzle apart and pass it on to another guest to put together and decode the message.

Make a Disguise (ages 5-10)
Cut moustaches and beards from foam sheets and wear with elastic string or tape.

Refreshments
Serve High profile spy treats like white grape juice, shaken, not stirred. Toss in a green grape for nice looks. 

Serve other high living foods with this drink, buffet style.

Or, choose treats a sleuth wearing a trench coat might keep with him on the go. 

Try a drink in a thermos, or individual snack bags of different foods.