Nancy and her friends travel to Costa Rica for a vacation, but find the resort in a shambles and most of the monkeys mysteriously gone.

Bess, George, and I volunteered to go to Costa Rica for some R&R: rest and research. See, Corcovado Ecologica, a popular resort and preserve, isn't only a beautiful getaway; it's also a great place to study three species of monkeys. Or so we thought. When we arrived on the scene, we found the place in a shambles, and the monkeys were few and far between. And if the problem gets worse, the resort's going to be in trouble. Clearly my friends and I won't have much time for "monkeying around" on this trip -- we've got a case to crack! Catch my next case: Secret of the Spa

Bess, George, and Nancy go to Costa Rica for rest and research and end up working on a mystery.

How about a seat at a mystery dinner on a riverboat? Yes, please! I jumped at the invitation to go along with Bess, George, and George's mom, who was hired to cater the dinner. It's all fun until there's an actual theft, and there's nothing like a good crime to stop a party. Since I've got the magnifying glass, it's up to me to catch "sticky fingers" before this dinner's sunk.

Nancy Drew and her friends investigate a murder case, that involves some members of the university basketball team.