DIY Trick Only Secret Agents Use

Dealing with amateurs is so annoying. Spy Slime Sam is trying to teach his pet human Sue top secret spy code but she's being so difficult! Instead of deciphering Sam's secret message she just... draws with milk and lemon! Meanwhile, something valuable is missing and these two will try to get to the bottom of it.... Watch the video to find out the ultimate spy hack, make invisible ink and then paint incredible pictures! Spoiler alert: those pictures can also be a night light!

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Title: Cuckoo